Bill,
I have about 4 donor bodies in varying states of salvage, I'm pretty sure I have the screw you need but the parts are all at my other house (presently I'm only there weekends pending sale of the 2nd house), so I cannot be absolutely sure until Saturday. If I have one you are more than welcome.
I thought the term "Jiffy" bag was from the colonies 😛 - it's a padded envelope with either bubble wrap or shredded paper as the padding, inside a kraft outer.
Wow! I just noticed your postal - that's a bit out of the ordinary, but should still only cost the minimum for a small airmail packet. If I can send you the screw, please don't worry about the cost, I'd far rather you sent me a couple of nice temple shots, taken with your Yashica. Does that sound fair?