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Hi, I am continuing with my Whirlwind J5, 9 cylinder radial build, and have finally reached the point where I am assembling parts! With the kit, which was second hand to me but had not really been started, came some gears, some of which had machining done, for example lightening holes. The cam...

Hi, I am building a model 125cc 9 cylinder Wright Whirlwind J5 radial. I need to source or make a sight glass to check oil level in the planetary gearbox. The wall thickness is 4mm Aluminium, with no space on the internal side for a nut. The hole diameter should ideally be about 8mm. I...