HI again... Well your lbs is clueless just as me trying to write in english... hehehe nothing personal for the lbs ok?...
Well, some shimano MTB cranksets have them in the box, are made to space the BB cups, they should have a few for sure laying around... they come in the box but if they arent needed they keep them just in case somebody needs them. Are made of a super ultra hard plastic.
http://www.loosescrews.com/Products/BR-FWS2.html
http://www.parktool.com/repair/readhowto.asp?id=95
In the second link u'll see a few pictures of some sets that have them, for sure the guys have a few laying around. Eventhough they are for BB cups they wil fit more than fine the wheel threads..
Have fun
