Please some good advise for safely unwinding (and rewinding/tightening) the cap screws on the TX-472 US Tower Hub City Gear Box in order to drain and refill the oil lubricant. The Cap Screws on my un
I replace the oil once or twice a year. I use an allen wrench to remove the drain plugs - bottom and side (side to check re-fill level), and a small open end wrench to open the top nut that has the b