I posted a topic here:
Looking for info on a 64-3
about my 64-3 that I just got, but the conversation started to go more towards parts and repair so I thought maybe I might get a better answer here instead ... if that is permitted.

The problem is the yoke screw. I am used to seeing the one on the left in my pic that is referred to as an "assembly", but my gun has the one on the right. It's smaller and has no spring loaded point like the normal one. Is this correct for this model or am I missing something?

Attached Images

screw.jpg (45.5 KB, 9 views)

So a little more info for the puzzle.
There are 3 screws holding the side plate on. One is flat and the other two are round.
We all know about the flat one and that one seems fine and correct on my gun so let's skip that one.
Of the other 2 screws, one is usually a regular looking screw but the other one is the yoke screw which is usually an assembly. Well I just checked and on my gun those other two screws are the same. I switched them around to make sure and yep, they both work in both spots so they appear to be the same screw type.

Your yoke screw is correct. The one on the left is for the revised yoke retension assembly in the newer models.

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Ret. LE, FA Instr, S&W Armorer

Thank you. Very much appreciated.