I went an ordered Maxamps because of the Trakpower dimensions listed on their website. After seeing the above, I managed to find someone with Trakpower saddles and measured them. They are not 47mm as stated on the website, they are a nanometer above 45mm. Which....is the exact distance you need to squeeze the above in with a B44 shaft.
I would rather not change the whole drive section to a B44. It's not so much cost, but I haven't had any problems with a BJ4 one, and if I am really honest - downright laziness.
Does anyone have any bright ideas on extending the "thinner" B44 drive to save switching the whole drive shaft assembly to a B44 one?
or....Maybe know someone that will make a bespoke one, perhaps extend the cups somehow? For us lazy people, we would spend about £30-£40 just to save on the hassle