New headset cups loose against the frame Trying to replace the headset cups and race faces on a steel frame for 1" fork. Removed the old cups by gently knocking them in a circle with a steel pipe of the correct diameter. However, the new cup are a hair too small - although no wobble, they are freely inserted and removed from the head tube. The slack is much less than a mm.

The LBS said that this is normal, and that they can fix it, by inserting something in between the head tube and cups. So is it normal? The headset is this one and the fork is a cheap Zoom 1 inch threaded fork.

What should be inserted, so that the cups can be correctly installed? (I was planning on using the hummer and piece of wood technique)



EDIT:

I purchased a calliper.  30.0mm cup, 30.2mm frame. Тhe cup is really easy to insert while pinching it with fingers, although it does not wobble.

EDIT:

I purchased 2-component glue and nailed the thing in place.
What the LBS may intend to do is add some Loctite or similar chemical retaining compound. The compound is going to glue the cups into the headset. The material will fill in the very small space between the two pieces. The space may be due to machine tolerances with the frame being on the large side of the spec and the headset on the small end of the spec or previous damage to the frame.