Simon K I'm OK with sending it to you if Dave is OK with it, of course it will have to wait until Kev is finished with it.

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Jenk.

Please only use it for drilling a 6mm pilot hole, don't drill the bush bigger. Needs to stay 6mm to fit this hard drill if needed.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

You could try some flat bar, drill a 6mm hole in one end, weld through the hole onto the bolt end. Then use the bar as a type of spanner, might work?

Just make a simple drill jig. No need to get fancy and fit a bush if only for occasional use, just measure the triangular spacing of the 3 holes on a good block, mark out some 20mm steel plate accurately, and drill 3 holes with a bench drill so they are straight.
2 of em make 5/16" for the bolts, and the other one, drill it 6.0mm for a pilot drill. Or if you're feeling lucky, make it 7.0mm, which is near enough to the right tapping drill size (6.9mm) for the 5/16" UNF thread and will ensure the hole is drilled square, even with a hand drill.

Edited for clarity

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.