couldn't I just buy a no4 retaining pin and use that? I'd hate to use something like a paper clip or brass tack it would bug the hell out of me :P Scoob or anyone do you have a no5 retaining pin by chance?
I don't have a spare, sorry. You can probably get them from Numrich or a similar web seller. Shipping will probably by 10 times the price of the pin though