I've got an interesting question for you.The guy I sub uses E-60's.He said when he replaces coils he has to tap them on with a hammer,so the last time he had to change one he took the valve out and took 15 thousands off of it in the lathe.He then slid the coil over it,he said it was a good fit,no excessive slop,but now it would'nt work.He has since bought a new valve,tapped the coil on and it works.I don't know about the E-60's but I replaced the A coil on my E-57 and it slides on and off with no problem.