[JCharlton]

All of the above suggestions are good, to repeat:

• Cut the ends straight and clean

• Insert it all the way

• Give it a tug to seat it well

• Don't have tension on the tubes, keep them loose

• If the tube has been inserted a few times, replace it

And I'll add one that I found in our kit of bits

• DON'T BE MIXING METRIC AND IMPERIAL!