Resurrecting this thread to find out if anyone else have had strategies/ideas to tackle this.
I was using another X1 owner's instruction and his X1's TC had the drain plug. Well I crawled under mine and discovered my TC doesn't!
For some reason I thought the ATC 35L was for x35i models (35L... 35i) and that x28i has the ATC 350 (with drain plug per realoem). But am wrong.
After some digging around on the interweb, the newer ATC 35L is 10lbs lighter. Based on rough visual estimates, the 35L has less "fins" vs the 350 and seems to be a bit thinner at the bottom part.
Looks like I will have to get a thin tube. Is removal of the braces required?