Thanks dudes. Those tubes are new polycarbonate tubing. But here's where I really felt the big difference came in -- the new bottom allowed the added length so that I could escape the stubbiness of original design. More length is what I needed!
...plus a rebuilt rocket! I cut the original MLC rocket in half. Reworked the upper half by chopping off the cone (save for later), removing the mid section, and replacing it with a custom-cut pvc section and acrylic "fins." Then came my plans to permanently affix the bottom portion to the pack. The knurled ring was replaced by a sacrificed vitamin bottle lid of the right diameter. The bottom part of the MLC rocket is still inside all that styrene and putty.
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