I got a Yashica-A TLR with a stuck shutter on ebay for a good price as a project to work on for fun. I opened the shutter and attempted to remove the screw holding down the cocking lever. It was very tight. I applied more force and ... sheared off the head of the screw. I would like to say lesson learned, but honestly I'm not sure what I should have done differently. Any ideas?

Any ideas on how to remove the remainder of the screw to continue the repair? At this point I plan to try to drill it out with wire gauge drill bits and maybe find a replacement screw. Or maybe just keep it for parts for future projects!

Thanks for any advice! Despite the occasional frustration, I really enjoy these repair jobs and have mostly had great success.