jessica halgren said that the washers she ordered were not centered
and flat, and that she could have done as well herself. i had the
same problem with washers i had ordered from rio grande a while back.
i solved my problem by ordering circular blanks and
punching/drilling the center myself.
rio has the sterling discs (no hole) in their raw materials section
of their gem and findings catalog, page 43. i also bought blank
discs from indian jeweler's supply (on page 4 of their materials
catalog). ijs had some sizes that rio didn't offer: some metric
sizes that just fit the bill for me.
i then used transfer punches and a disc cutter to find the center of
the circle. i placed the blank disc on my work surface, put the disc
cutter on top of the disc with the cutter upside down so that it
would hold the disc firmly, and then slid the transfer punch into the
cutter to mark the disc.
by ordering the blank disks i didn't have any silver waste or
mistakes where i didn't get the silver positioned correctly in the
hope this helps,