I just had him put tubes (same brand) in a .410 single barrel (pump). The tubes are snug, The whole way down. One needs to be wrenched from about the half way installed point.
That doesnt sound right. Choke tubes seem to get pounded in tight, with heavy or steel loads, and I generally pull and lube them after use. I wouldnt want a loose one.
Did you try emailing Mike? Ive had good results with the computer and him.

Best,
Ted