MMT Discovery (& 2nd discovery)

I don't know if either of these are already widely known, but they were pleasant surprises to me. The other day at the Safeway (supermarket), in the produce department, I noticed some of the empty brown paper cores that had held the plastic bags for putting your vegetables in. I took the 3 empty cores, thinking they may be just right for a 38mm motor mount tube. I measured 'em with a ruler I didn't buy & they looked very close. When I got home, I tried a 38mm reload casing & it was a good fit. Though only 12 inches, they could used in some applications as is, or joined for a longer MMT. They're free (& plenty thick-walled enough). Does anyone know other cores ideal for our purposes? The other discovery was after tightening down too much a (wrong length?) brass Kaplow Klip & mooshing my 24mm MMT at the back end (at that point, still pushing the envelope on Estes tubes). I cut a 1/4 ring from the top of a 29mm G80 single-use spent motor & epoxied & filleted over the remaining good portion of smooshed MMT. It fit perfectly! And it can withstand tightening down on Kaplow Klip. -- Richard "now I make sure I use the right Klip or tape motor end appropriately to fit" Hickok