How is one supposed to install metal TPV fittings?

nebosn

New member
Hi all,
I personally like the idea of 12,7/7,6mm tubing, just small enough that it doesn't obstruct anything, but still large enough to have plenty of flow.
I hate even a though of using nylon based fittings and opted for metal ones and with them have a problem.
Tried everything that could imagine, drop of oil, soapy water, just plain cooling liquid, putting tube end in hot water....
What ever I try I can make 1 or 2 turns of the aluminum cap and that is it. Looks ugly and not pretty safe to me fo tighter bends that this tube can do nicely.
Tried using a wrench but even then not getting very far and risking damage that way.
So a question, is there a trick here or I should just abandon 12,7/7,6mm tubing as an idea altogether?
 
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