Originally Posted by
Rowan
While I agree with you on the technical aspect, the most important thing to make sure of is that the headset is the right one. There are quite a few types out there, and the differences between them are subtle, but sufficient enough to break either the cup or the headtube on installation.
It pays to check and double check, and I have found a vernier gauge has become a very useful item in my tool collection.
I've got telescoping guages and mics, calipers etc. I'll be sure to be carefull with my choice.