Hugh,
An auction for Stronglight 57 chainring fasteners (I was searching for "stronglight chainring") that are MADE by this guy was what led me to the Stronglight crankset auction :
http://page11.auctions.yahoo.co.jp/
His stuff is expensive at about $110 a set, but when you machine things from scratch there is a lot of labor (hours) involved to make 5 + 5 items. For 10x items, made from scratch and plated, the price is fair imho.
If you have no other source, I would recommend that your save your pennies and buy his fasteners because it will saves you hours (10+) of searching and is therefore cheap (use the time you save to go for a ride and get healthy, drop your health club membership to pay for the chainring fasteners, etc ...)
- Don Gillies
San Diego, CA,USA