Stan:
I believe most people go with 5/16 - 18 in the T/A. Coarse thread works
better in aluminum. This is what Triumph should have used. You'll use the
same drill bit size as with 5/16 fine thread. Adjust your drill to very slow
speed and more torque. Use cutting oil with drill and tap.
We replaced them all as a safety measure. 2 were broken. An LBC mechanic
helicoiled the other side - he used metric. Does your drill have a built in
level or do you have some method to drill as straight as possible.
I believe you can torque the coarse thread bolts to a higher number- but I
don't know exactly how much.
Bruce Simms
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