I can find plenty of socket head screws the correct diameters, pitch and length for my chinese motors, but the 10mm head diameter of the 6mm bolts are too large. I mostly looked in the McMaster--Carr catalog. I was ready to buy packs of 100 until I saw the problem. I looked for threads addressing this topic, but came of empty. Maybe some of you know a vendor that sells hardware sets. Thanks in advance for your suggestions.