Hello Silverleaf

The 11 tooth gear is considered a driving sprocket.
Because it is powered by a clockwise spinning engine,
the thread must be conventional RH.

Usually a pin punch is all that is needed.

Hope this helps.
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Jack

p.s. Also consider Victa Service Guide No. 57 ...
https://www.outdoorking-forum.com.au/forum/ubbthreads.php/topics/58949/VICTA_SERVICE_GUIDES_-_1960s.html