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Yep, I should have considered that the bolt would have a long, or indeed very long shoulder.
Dunno how that escaped me to be honest.
Maybe I've got used to sub standard engineering becoming more commonplace over the years.
You would have to be very careful drilling the head off with a 10mm drill though .. any slight error in centring or parallel could easily result in damage to the swingarm as the drill breaks through.
Also, if you're only drilling to the depth of the head, a std length drill might be long enough.
And now that I think of it, maybe some sort of wide collar could be put over the drill to prevent drilling too deep.
Or maybe a shouldered bush with a 10mm bore made to fit the hole in the swingarm and serving a similar purpose.
I'm throwing ideas off the cuff here but its all food for thought, eh ?
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