Here are two pictures of the holes with the missing/broken bolts. Still nothing removed just used a tiny USB camera for a smartphone. More bolts will most probably break. These broken bolts have been my biggest concern so far because experience is the key factor. Regarding the rear main seal I would use the divided 3†Bop Viton seal so that the crank case can be left in place and only the main cap anti rotation holes require high temp silicon. For removing the old rope seal there is this sneaky pete tool. I think i need an exit strategy, i.e. when to hand over to a pro. This can be when the holes need to be retapped and/or the crank case needs to be loosened or removed in case the Viton seal doesn’t work.