Fitting issue on the Yashica-12 TLR

[HHS]

@Dan Daniel and @monopix
Thank you both for your very, very helpful assessment—it all makes sense now:

And indeed, the winding stop arm was adjusted to the radius of the rotary disc without the claw running inside. It should have been adjusted to the radius of the claw running inside, as can be seen in the monopix video. That's why it kept getting stuck instead of running smoothly.

To my surprise, it could actually be bent into shape by hand without tools, I tried to do the best I could, as the metal seems rather brittle.

Apart from the lack of lubrication, and the now really worn out used film, which gave additional resistance, it now runs perfectly in my opinion.

Please take a look at the video:

 

[monopix]

Looks good to me.

 

[HHS]

Looks good to me.

A better video:

Is there anything I need to pay particular attention to when cleaning and lubricating the parts? For the small black levers, I would use a needle tip of low-viscosity lubricating oil, for the surfaces of the brass gears, medium-viscosity lubricating grease, and for the axles and bearings, low-viscosity lubricating grease - would that be correct?

 

[Dan Daniel]

Leave the black levers alone unless they are showing signs of needing lubrication. You want them moving freely.

All in all, the less lubrication the better. The brass gear off of the main center disk and the gear off of it that drives the spool can use heavy grease. Leave the counter assembly alone- it needs to move freely to react to release and the pawl dropping. No grease on gear teeth that drive the counter.

YashicaMats are known for a bit of a potato masher feel. Not really possible to get quiet slick operation.