Hi all, had anyone rebuilt a water pump for an f4? They are discontinued on partzilla and bike bandit says 1 to 2 weeks, mine is seeping from the weephole, I've been rebuilding this bike slowly over time, the engine runs great and everything is working as it should except for the tiny leak, I can get the seals for the pump but I'm not sure if I need any fancy tools to disassemble the pump. Any help or advice on this would be great.