only problem i had with mine was i sheared off the brake pivot, mainly due to MountainCycle using M6 fitting as opposed to the usual M8 or M10 and quite soft material too (combined with me thinking i could do 'back hops' while out near some BMX kids )
so i drilled and tapped my frame to M8 and solidly bolted it in place.
on a 'normal' frame, there wouldnt be a problem
Love the mountain cycle!im thinking of knocking one up in my workshop ust to see if it would work got plenty of aluminium plate cobbling around. Dont think i could drill it as the swing arm is box section dont think it would take the stress.
Thanks for pointing me to your thread