Onza internal headsets are different to standard if i remember correctly, as you can get a few different sizes. had the same problem when build my jump bike as usually its a 45x45 degree bearing but mine was 45x35
http://www.rocknrollbikes.com/trials/onza-open-bearing-internal-headset.html
what i had in my t-bird which was the same gen as your t-pro if you get me
So do i on my rockman maladie, which is effectively a comp frame, explain that then? The true deffinition of trials is getting over an obsticale without your feet leaving the pedals, which he does. so shutup.