I was just recently looking at drivers for the oyster bracelet links when I saw this post. Not sure if the drive I ordered is exactly OPs. So I searched and ended up getting the 260p 1.8 x 40 slotted screwdriver. The SKU# is 26055. Unfortunately, Amazon doesn't have the 260p just the 260. So here is the link where I found them. Price shipped was $11.63. If this is the one that's a bargain!
http://www.wihatools.com/picofinish-...d-screwdrivers