Talking about P/Poor brakes, my Mk8 Pursang had terrible brakes, chrome on alloy hubs i think [weight saving], i just put up with it in the end. But, thinking back to my first old BSA back in early 60's my then w/shop boss had a 350 goldy & swore by taking away the pivoted end of shoes [if located sideways by a 'mushroom head] recon'd letting them float let them find the best spot to work better. in a way i suppose its no different to car brake shoes being able to move--or my old suzy quad front ones. Just a thought anyway & used to do that myself in the old days, then the jap stuff arrived & no more problems. Talking about the Mk8, it had the best aircleaner set up just thinking back--rubber tube with a flange on then extended up into the filer a bit & was fullproof [or idiot proof in my case & couldn't muck it up as i recall].