I took the old ignition triggers off that work off the flywheel and found that the hole in the crankcase for the trigger leads is the same size as the sump plug 22mm x 1.5.
I have ordered a 22mm die and some 25mm hex aluminium bar so will turn up two hex plugs one for the sump (with the addition of a strong magnet) and one to blank off the redundant trigger leads.
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