What I do, is turn the engine clockwise and pull the belt, there is a tool for that but I never really needed to decide buying it. I can see the crankshaft pulley even with the cover on so it is not fully covered...I will investigate the length of the belt/s, I couldn't find a model without air compressor so I can only assume the accessories belt was an improvised match, try measuring it and find a smaller one by 2-3 mm, should stop the squicking. Hope it helps.