Why is it that when ever I am tidying up internal threads ( various sizes ) that the correct sized tap does more than simply remove the damaged thread and locking compound , it actually removes metal right along the thread , so much so that there is a noticable difference in the size of the hole , IE thread a good bolt into a good thread and it feels nice and firm , run a plug tap ( correct size ) thru it and now the bolt feel noticably loose .Using a good quality tap ( not some cheap shit thing ) with a bit of thread cutting lube and cleaning hole and tap ( comp air )( and goggles
) every 5-6mm or so. Pissin me off !!
) ally V8 cyl head exhaust manifold mounts ( 16 holes ) , I only tapped 2 b4 The penny dropped , so I have to heli-coil them ...... but then they arnt all the same 
so I just had to do the rest . Things like that bug the shit outa me . I struggle with my Guzzi as I can see one cyl is forward than the other , the beemer is worse ( side x side con rods ), I know the paso is the same but I cant see it whilst on the bike 
