I'm fairly new to bmx, just started last year. I bought a specialized street boy that came with 1 piece cranks. After about 1 month of progresively tougher abuse from riding street, they bent - making it awkward to pedal. I would like to invest in some 3 piece cranks and I would like to install them myself too. Is there a site with tutorials on installations of bmx parts, or, would a quality set of cranks like primos come with instructions?