:pout Well I'm in the process of making super tiny joints, and the drill bit i have tends to break the joints i make by hand. By any chance is there any place that sells styrofoam spheres about 6-12 mm. I found a link somewhere in the work in progress, but can't seem to find the link.
The last mixed bag of styrofoam balls I ordered from a UK ebay merchant had about 10 each of 9 and 15mm balls (the largest size in the pack was 40mm) those seem to be the smallest they have. Perhaps beanbag filling balls would be a smaller alternative?
http://www.ebay.co.uk/itm/ws/eBayISAPI.dll?ViewItem&item=190552411905 I think this will be a good range of sizes enough for tinies all the way up to SD13. Use them to make balljoint moulds on a clay block. They last longer than the polystyrene itself.