I have one but possibly many more parts that just need a tune up. It's a 6" long x 6" ID aluminum tube with 1/4" walls. The cost is way cheaper than precision tubing of that size and I want to know how others would go about fixing it. The problem is it's ~0.004" difference when measured at 90 degree locations (oval) and 5.990" average ID. I need it 'closer' to round (it is all O-ringed parts inside which will round it somewhat) but I definitely need it larger - between 6.000"-6.010"...
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