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Hello from sunny Camberley
Don't be tempted to run without the tube. Crankcase pressure fluctuations will blow out through the bearing cap and dump all of the oil exiting the rear main into the bell housing. The aim is to get the bottom of the pipe below the surface of the oil in the sump to prevent this. I had 2 tries at tack welding the pipe and both failed but the pipe stayed in situ as its bend stops it from winding out. I'm now running ok on a pipe retained with heavy grade Loctite 270. The tube thread is 32tpi 3/8 but it's cheaper to get one from Belchers rather than make one as the UNEF dies cost a fortune in the UK.