this technique is just fine for fork crown race seats but should not be employed on head tubes.
an easy, free and no-fuss solution is to shim the head cups with some aluminum beverage can material. one must be careful when pressing the cups in that the shim material remains on the vertical surface only and does not get between the end of the head tube and the cup. press the cups in and do not bang them in.
Last edited by juvela; 06-11-15 at 12:30 PM.
Reason: spelling correction