As far as I know the current versions of the NCR kits all use standard 29mm mounts.
A few thoughts on the video:
1) Very nicely done!
2) Did you think to weigh the tube before and after? I would guess you haven't added enough weight to affect anything, but curious anyway.
3) This effort really shouldn't be necessary. It's so much easier to sand out a tight centering ring, not quite sure why NCR doesn't just size the rings a bit smaller and eliminate the need for this sort of thing.
But again, very nicely done, you made the process seem pretty simple and straightforward. The first time I heard of someone rolling their own tubes I thought it was insane, but it's really not so bad I guess, as long as you have an appropriate mandrel.
I didn't think to weigh it before and after. Too bad, considering
my obsession lately with figuring out how much weight different components and materials add.
I recently did a test with some wood glue, for example, where I tried to figure out how much of the weight was water - in other words, when it dries out, how much mass would it lose? Turns out, with the brand I use anyway, around 40 percent.
I should have weighed it, but it doesn't feel much heavier. Still, I get curious about those things.
Thanks for the comments. I wasn't expecting it to be so straightforward. I thought it might work, but would come out messier or be harder than it was.
I guess my next experiment will be turning a nose cone on a drill. I know people do that, but I don't know how hard it is. Figuring that out would make a fun video, I think.