Here is a step by step detail of how to get a LM carby to work properly, G4 is at the end of this post, only difference is the cam modification, all other steps are the same

You will require a 6mm or 1/4 tap and two 25mm bolts (cut both of these to 18mm), 1 nut of whatever thread gauge you choose.
You also need a kill switch, this can be either a momentory contact switch or toggle switch, a little bit of electrical wire, lug and a connector

It requires a marker, hacksaw and 2 sockets to act as spacers to hold the cam steady in a vice, do not over tighten the vice as this will damage the cam

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Thread this with a 6mm or 1/4 thread (whatever matches the bolt you have), cut this bolt to 17/18mm long
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