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The WD Motorcycle forum
Don’t know the thread size, but I do know that de groot have the correct screw for €7.50, part no 27-0181 https://degroot-bsa.nl/product/crankcase-tale-plug-bsa-m20-wd-en/
email (option): LarkesrATgeeemil.com
It's 1/2" x 20tpi Cycle thread I recall...Possibly 9/16" but definitely 20tpi...I'll measure one and confirm tomorrow...Ian
email (option): ian@wright52.plus.com
I've now checked...1/2" x 20 tpi Cycle thread....Ian
email (option): LAGONAS21@WINDOWSLIVE.COM
thank you sir