I took my bike in today to have the oil pump seals changed and get a set of genuine Honda exhaust mounting studs fitted to replace the rust prone homemade junk currently in place.
The mechanic had to tell me he would only try so hard if any are very stubborn, lest they snap off. If that happened where would I stand though?
A local engineering firm Helicoiled four of my head studs on the 500 I snapped three , removed four, left one for them - one is fractionally out of alignment so the new Delkevic clamps would not fit one pair of studs.
I used my originals that have more clearance. They skimmed my head as well - they did a brilliant job removing only a few thou to get rid of a couple of marks near where the head gasket seals the bores leaving a mirror type finish. It cost more than I expected tbh.