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The ones you make yourself. When I trained as a gunmaker in the UK you were expected to make your own tools and turnscrews (close fitting screwdrivers) had to be a perfect fit in the screw heads....

Could anybody give me the barrel thread dimentions for the Lugar P-08.

Well done Mick, you went to court for all who want to legally build an open bolt semi-auto sten

4041 is a very heat treatable steel but you need to lookout for two issues:

1/ Distortion, due to heat treatment process.

2/ Brittleness, due to leaving the firing pin too hard

Method:
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Thanks for the great pictures and useful advice on the conversion of the selector to a safety. I personal did not like the idea of welding the selector up, so the safety idea works for me.