All your tubes cracked?
If you have xls and standards, you can take scissors to the xls, cut off both cracked ends and make a standard size tube.
The one I'm showing hasn't been scissored, I was too lazy to take my current scissored cart apart (I'm vaping it) but it works nicely. It seems to hold up better too as I think they are sawing these things which puts tiny cracks into them from the get-go, by cutting, they don't seem to crack as easy, I haven't had one crack yet (a few days of use on one) and I'm shoving a drip tip on the end. The other end seems to swell vs. crack.
Maybe the Chinese QC folks will read this and stop shipping cracked (ever so slightly, but sure to grow)clearomizer crackomizer tubes. 
YMMV
If you have xls and standards, you can take scissors to the xls, cut off both cracked ends and make a standard size tube.
The one I'm showing hasn't been scissored, I was too lazy to take my current scissored cart apart (I'm vaping it) but it works nicely. It seems to hold up better too as I think they are sawing these things which puts tiny cracks into them from the get-go, by cutting, they don't seem to crack as easy, I haven't had one crack yet (a few days of use on one) and I'm shoving a drip tip on the end. The other end seems to swell vs. crack.
Maybe the Chinese QC folks will read this and stop shipping cracked (ever so slightly, but sure to grow)

YMMV
