Bruce, the concentricity of the original tubes is compromised to a degree by extensive hand fitting. Draw filing for shape prior to assembly was done by hand, causing varible wall thickness. Measuring the O.D. and I.D. cant allways detect this. The greatest culprit in this case is the fitting and solder removal from the top rib. To acheive a prefect fit of the rib removes quite a bit of material. My biggest concern for these tubes is the top rib not holding during recoil. I don't know of any quick fix.
Brad
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