Hi Mario, nothing to do with your engineering skills....it just so happened that the wheels of my sons Lego dirt crusher rc car fitted the half inch shaft of the Pirahna gearbox/motor assembly which I got from Robot Marketplace. The only problem was that Lego plastic wasnt very tough and it didnt take long for the hubs to disintegrate !Grant told me the solution is to have some steel liners machined to convert my blue wheel oversized hubs to accept a half inch key shaft.
John....cant do the video, I tried all day Sunday to copy the mini DVD from my camcorder onto my PC so I can edit the footage, but it just wouldnt transfer.DVD plays great, maybe Im doing something wrong ?!