geepeetee wrote:
Hi

I am intrigued now, the headset really doesn't have bearings.

I don't believe that. Have you removed the stem and forks yet to look
inside?

The
headtube is slightly conical at both ends and a circular split bush
compresses into the headtube when the central allen screw is
tightened. I have googled for it but cant find any info or images.

The bike is a trek 7200 hybrid.

Integrated headset?
http://www.parktool.com/repair/readhowto.asp?id=68

Do you really mean head tube or steer tube?

Does it have anything like this:
http://www.chainreactioncycles.com/M...x?ModelID=2741 ?

~PB