My Glaswegian friend is correct on the drill-bit. No drilling involved, you're using it as a reference spacer, to gap the (we in the Colonies call them) butterflies all the same. That's the 'bench-set.' Then you do the engine running adjustment as described in the Service Manual.
Do you have any baling wire? Just cut a couple pieces maybe 3" long, stick 'em into the butterfly gap, and tighten things up to just touch the wire thickness. Do the same for the other pair of butterflies. The screws should NOT be 'coil-bound,' that is, coils touching so-that you can no-longer screw in the slot head screw for that coil spring.
Whatever you have which is thin in the way of wire is what you need, sized the same thickness, of-course. Maybe a pair of m'lady's sewing needles? A couple lengths of 22 ga. solid-core wire, stripped of insulation? If you've ever set a pair of ignition points, you should be familiar with the tension, setting tappets is somewhat similar, the tension on the feeler gauges should be enough to create a bit of drag when you try to remove the feeler gauge, but not-enough to make it 'sticky' to remove. In other words, you're taking-up the slack.
http://vmoa.net/VMX12-Service-Manual01.pdf
Do you have any baling wire? Just cut a couple pieces maybe 3" long, stick 'em into the butterfly gap, and tighten things up to just touch the wire thickness. Do the same for the other pair of butterflies. The screws should NOT be 'coil-bound,' that is, coils touching so-that you can no-longer screw in the slot head screw for that coil spring.
Whatever you have which is thin in the way of wire is what you need, sized the same thickness, of-course. Maybe a pair of m'lady's sewing needles? A couple lengths of 22 ga. solid-core wire, stripped of insulation? If you've ever set a pair of ignition points, you should be familiar with the tension, setting tappets is somewhat similar, the tension on the feeler gauges should be enough to create a bit of drag when you try to remove the feeler gauge, but not-enough to make it 'sticky' to remove. In other words, you're taking-up the slack.
http://vmoa.net/VMX12-Service-Manual01.pdf
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