Pen tube length

[Lfrost]

I'm new to pen turning having only turned about 10 of them. I was gluing in three tubes to three blanks. 2 were Berra sierras and 1 was a Lazerlinez Liberty. The diameters of the tubes were the same but the Liberty tube was slightly longer. I looked on Lazerlinez website and they advertise the liberty tube as being "sierra length." Can anyone explain?

 

[KenV]

All things are made to tolerances. How much was "slightly longer"? If it was a hundredth of an inch (0.010) or less, probably within tolerance.

The difference results in a difference in protrusion of the refill when extended.

 

[Lfrost]

I wish I would've measured but I didn't. It was easy to see it was longer. I have another tube and I'll measure that one tomorrow. I know the tube length effects the protrusion which was why I was surprised it was different.