Soft tubing is Really Really Hard to cut square. Best I can do freehand is with a straight edged razor blade while hosted on an I.D. sized piece of rigid tubing, dowel or rod acting as a mandrel, but even then, it is a challenge.
If I really need it as perfectly square as possible, I do the above with the mandrel piece chucked up in my lathe, with the razor blade held ridged against the side of the tool post and turn the chuck by hand. Sometimes, it still takes several tries, even when set-up like this!
That is some good ideas, I remade the one in my 3rd photo free hand and it looks like sh*t. Then I used my caliper's straight edge to use my razor blade to cut the tube (while smushing the tube flat). It was mucho better, though still not perfect.
Regardless: I cut two seals, lube/mount fittings/seals onto sight glass and finger tighten - under 10 minutes. Compared to what seem hours before, I call this a win (assuming the seals hold).
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