Nikkor 210mm f5.6 repair

I just got my very first LF lens and it was acting odd. The shutter speeds below 1/8th were faster than they should've been and seem to be shooting at the max speed.

I decided to take it apart to clean the blades and the slow speed governor. When I inspected the lens some more it looks as if someone else already took it apart. There's a screw missing on the back and the screw(402-1) for the between lever(402) is sheered off. How would I get out such a tiny screw and where could I order more?

https://learncamerarepair.com/downloads/pdf/Copal-0-1-3-Parts.pdf

The parts list says 402-1 click spring . A picture of your shutter will help.
https://www.metricscrews.us/

The 402-1 screw on the Copal #1 shutter is one that you often find broken for a reason: It is a small 1.4mm thread with a large head and is left hand thread. So when someone attempts to remove it and turn it counterclockwise with enough force, it will snap off. I remove the broken stud with a pick. If you manage to get the broken part out and need a replacement screw, PM me as I stock that part.

shutterfinger said:

The parts list says 402-1 click spring . A picture of your shutter will help.
https://www.metricscrews.us/

Click to expand...

I guess I should've stated that this lens has the Copal shutter 1. I would be the clock spring on the Copal shutter 0.