Bob Mannix wrote

Call me simple minded (many have) but I can't quite see how quoting a piece
from the manufacturers saying "..hacksaws should not be used.", is in any
way a justification for using hacksaws.

Just what I was going to say. He says he trimmed it with a Stanley knife - it
would have been simpler, quicker and a better result to just cut the pipe with
that!

Peter