Some timely progress thanks to watching the video and mail being early today. Thanks
halliwax and
Trooper_trent!
Still a little sanding left to do to get rid of the threading lip that is ever so slightly present due to using the hacksaw and not wanting to get too close to the tube itself.
*edit
Actually guys, the threading is an insert! Might be a way to pull it out if you loosen whatever adhesive there is. Only downside of accomplishing that would be that the bottom cap from the kit wouldn’t fit anymore. Stick with the cutting. It was quick and easy.