AJS & Matchless Owners Club

Can anyone help ?
Almost finished rebuilding my 1955 AJS model 20 and have a small problem with the inner casing of the primary chain case . the are three holes in it that are blanked off with rubber gromets should they all be blanked off or should one be left without the gromet ?
Thanks in advance
John

I can't remember any extra holes in the inner chaincase. There are the 3 mounting screw holes where it fastens to the crankcase and the 7/16" hole for the central stud and that's it apart from the hole for the clutch. I'd blank them off with grommets.
Dave

Thankyou dave16mct !!!