MP rewind problem, any advice?

[_sparkie_]

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Hey Everyone, I have been lurking here for a long time but I finally have a question that you may be able to help me with. Over the last few weeks a small problem has developed with the two red dots in the centre rewind mechanism on my MP. They have come loose, it's like the rewind knob is somehow also turning the red dots when I am winding up a roll. The red dots fell off recently, luckily I was at my desk and didn't loose the piece but I need to find a way to screw it back down and secure it.

 

Has anyone else ever had this problem and is there a way I can solve it myself without having to send it away for repair? Thanks!

[250swb]

There is a tool with two pegs that fits into the depressions filled with red paint, it is in effect a kind of screwdriver. Place the part back in position with the tool in place and with an ordinary broad bladed screwdriver turn the shaft from the inside of the camera using the notch that engages the fill spool. If you hold the peg tool securely in a fixed position as you tighten from the inside it should stop you scratching the exterior paint. The necessary tool can be bought from eBay. You might want to put a tiny dab of thread lock onto the threads before you tighten.

Edited June 2, 2020 by 250swb

[Mute-on]

It is also possible to make the two peg tool by either:

1. Sacrificing a flat screwdriver of the required width by grinding away the centre to create two “horns”

2. Clamping two metal skewers in a pair of locking pliers at the correct distance apart, after first grinding or sanding down the tips to a blunt profile

In any case, wrap all metal parts of your tool in masking or other tape to protect against damage, but use soft electrical tape over the tips to avoid scratching the red paint. 

Also wrap the flat bladed screwdriver that you use to lock the rewind fork in place with tape to avoid damage to the fork and film chamber. 

Good luck!

Edited June 2, 2020 by Mute-on

[_sparkie_]

Thanks lads, a friend of mine who is an industrial designer with a workshop has said he will do it with the correct tools.

[Mute-on]

Brilliant Sparkie. Love my MP

[_sparkie_]

54 minutes ago, Mute-on said:

Brilliant Sparkie. Love my MP

Yeah, I love mine too, so much that I'm on the hunt for another one at the moment. Hopefully I can get this sorted today and back to work. 

[_sparkie_]

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Ok, I think I got it fixed but I have one more question. I put something in the forks to hold them in place and got a tool to tighten down the red dots. Can someone else with a MP check something for me, if you put your finger on the turning forks, is there about a 1/4 turn latency between the rewind knob and the forks turning? Is that normal or ar they ment to be directly equal?

Edited June 9, 2020 by _sparkie_

[TomB_tx]

There is some backlash or free play between the knob and fork by design. I don’t have an MP, but on my M2&3 models it’s about 10 degrees.

[Yaakov]

16 hours ago, _sparkie_ said:

Ok, I think I got it fixed but I have one more question. I put something in the forks to hold them in place and got a tool to tighten down the red dots. Can someone else with a MP check something for me, if you put your finger on the turning forks, is there about a 1/4 turn latency between the rewind knob and the forks turning? Is that normal or ar they ment to be directly equal?

I do feel a little latency, I can't really measure it but it feels more at the beginning of the movement then kind of catches up, at least that is how I feel it.

[_sparkie_]

Yeah, cool, it seems normal. I think it's finally sorted.

[_sparkie_]

Famous last words. I appears that after another month of use, the two red dots are loose again. I feel like the pull-up rewind knob is not straight anymore and that rewinding it is rubbing off the red dots, and loosening them. Does anyone know where I can buy a replacement rewind knob?

[250swb]

And did you use some thread lock?

[_sparkie_]

12 minutes ago, 250swb said:

And did you use some thread lock?

I didn't. My main reason being that if the parts are rubbing off each other because the rewind shaft is not straight, I didn't want to cause more mechanical damage by forcing them to crash together. If there is an easy way to source a rewind knob, I think that will do it. Have you used threadlock before to solve this exact problem?

[dkmoore]

35 minutes ago, _sparkie_ said:

I didn't. My main reason being that if the parts are rubbing off each other because the rewind shaft is not straight, I didn't want to cause more mechanical damage by forcing them to crash together. If there is an easy way to source a rewind knob, I think that will do it. Have you used threadlock before to solve this exact problem?

DAG or Leica NJ if you are in the USA. 

[250swb]

8 hours ago, _sparkie_ said:

I didn't. My main reason being that if the parts are rubbing off each other because the rewind shaft is not straight, I didn't want to cause more mechanical damage by forcing them to crash together. If there is an easy way to source a rewind knob, I think that will do it. Have you used threadlock before to solve this exact problem?

The cap with the two red dots on it is just that, a screw cap. It doesn't affect the rewind shaft or how much parts rub off against each other. A thread lock compound is just to secure it into it's thread, it doesn't force anything to do anything, only the operator can do that. Nothing is going to 'crash together' unless you aren't telling us the whole truth and that the shaft itself is bent. But given your lack of mechanical aptitude in understanding this and using words like 'rubbing' and 'crash' I think you aren't up to a simple job and you should absolutely definitely send it back to Leica.  

[_sparkie_]

14 hours ago, 250swb said:

The cap with the two red dots on it is just that, a screw cap. It doesn't affect the rewind shaft or how much parts rub off against each other. A thread lock compound is just to secure it into it's thread, it doesn't force anything to do anything, only the operator can do that. Nothing is going to 'crash together' unless you aren't telling us the whole truth and that the shaft itself is bent. But given your lack of mechanical aptitude in understanding this and using words like 'rubbing' and 'crash' I think you aren't up to a simple job and you should absolutely definitely send it back to Leica.  

You seem upset. Have a cup of tea, go outside, perhaps take a few deep breaths. 

[250swb]

A simple idea that works was presented to you, take it or leave it.