Had a bit of knocking from my Trek and think I have narrowed it down to the bottom bearing of the headset – I might try get a top part too, but after taking it out I can’t make out the figures on the side.
So the bottom bearing has TH MR019 1.5 36 x 45 F5 on it and after a search I have found its replacement:
http://gearmechhanger.com/FSA-Headset-bearing-TH073/DJ-15-36-x-45
FSA TH073/DJ 1.5″ 36 x 45 Headset bearing
Contact Angle: 36°×45°
Height: 7.5mm
ID: 40.0mm
OD: 51.8mm
Type: ACB
Type: Cartridge
Type: MR019
I have found this on CRC, but its TH-073 ‘E’ so not sure if fit is the same – but can get it delivered next day!
http://www.chainreactioncycles.com/fsa-bearing-th-073e-acb-1-5/rp-prod134153
Aslo – considering a different make as Cane Creek has been mentioned – but no idea how I would find which Cane Creek I would need – guessing if I went Cane Creek I woyld need a new Crown Race?
Any help/advice as always appreciated!!