Thank you for your advice, now may I strain you further? If replacing these items, (injectors, seals, insulators, and O-rings) will require a considerable investment in special tools, it might not be the best idea. What am I likely to need beyond a set of combination wrenches 4-24mm, 1/4 and 3/8 sockets 4-17mm, plus screwdrivers, channel-locks, etc. Thanks again, you people provide a great service.