Hi,
Can anyone confirm what the thread form is for the sludge traps on a small journal crank. I have measured what was left of the plug and it looks like it's going to be around 20 tpi, but what thread form? I need to clean the crank up because the previous person to reassemble it went crazy with the center punch!
Richard
Hi,
I believe they are 5/8 cycle 20 tpi option.
https://www.feked.com/bsa-small-journal-crankshaft-sludge-trap-plug-a7-and-a10-models-circa-1947-62.html
Best wishes...