i find it easier to put the tool in a vice and just turn the wheel left, which means that there is no need for any bars or spanners to slip and you don't nack your threds (Y)
sorry about your frame mate i did the same thing to my t-master (Y) . i rang up onza and the first thing they said wat type of riding was i doing and i said street and that why i smash it it a comp frame not for street. so if you buy don't think you gunna get any come back when you smash it or even crack it. SO NOT BUY ONZA !!!!