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Thanks for all your thoughts.
Yes, tbh I was pondering a wooden buck just now, while I was planting out my broccoli.
A few layers of thick plywood/mdf or summat.
I do also have a 2 inch length of massive ally bar, that is just a few mm bigger than the bore of the sleeve.
Turned down to a short plug, then maybe a slit in the end of the sleeve that I want to cut off and a ducting jubilee clip around the outside .. was a first thought.
BUT .. maybe with a plug inside, I could just grip the "waste" end (suitably slit) in the 4-jaw lathe chuck and hacksaw from there ?
I don't really fancy parting it off, or even spinning it at all in the lathe ... I envisage a crumpled mess.
Though I suppose I could mark the cut line nice and square by spinning it by hand, against a scriber.
You've got me going now.
I'm going to have to at least have a go at cutting it now, aren't I ?
But first I'll ponder your various other suggestions.
I may end up angle-grindering it.
Incidentally, I'm planning to rivet the sleeve directly to the end caps, ie without using straps.
I can't see the need for them with a titanium sleeve.
This was actually a small part of the reasoning behind getting the titanium sleeve .. it removes the cost of the straps as well as giving what I would consider to be a more secure fixing anyway.
Whatever the outcome, the ti sleeve only cost me £30.
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