these won't mate, whats happend, is when you use the inserts, the thread only winds down about 3 threads and leave some thread showing, so mine have got water in and rusted solid, so i had to cut the tube below the threads, so it would release the insert, the tops that i've took off are 4mm to thick, so they can't drop low enough over the insert, to reach the threads, i'am
to.i was going to fit them this week, as i've sent for some tein camber tops
.