email vinylnirvana.com and there's an outfit in the uk who specialize in thorens stuff.....you can contact them through their adds on ebay.
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McMaster-Carr has many metric screws. You didn't say the type head you need. Here is the metric screw page:
Try a hobby shop. They will usually carry both metric and english screws in the small sizes...2mm, 2.5mm etc.
Also, an audio store who carries turntables (I'm talking older specialty-audio stores not your big-box chain retailers) will usually have a box of small screws that they might let you rummage through.
If all else fails, find the right size screw and cut it to length. There are tools made for cutting screws and there are cut-off disks that you can use in a Dremmel.