>>2938239
So another issue I hadn't anticipated is that because the heat break tubes are different lengths, the PTFE tubes inside are different lengths too.

First: I'm assuming that I cannot use the shorter tube in place of the longer one.

Second: I'm assuming that those tubes are in fact made from PTFE (which I believe is just nylon?) and that if I go on ebay and get some PTFE tube of appropriate inner and outer diameters it should work fine.

Third: I'm assuming I DON'T want to use the long one in pic related because it's all chewed up on one end.

Are any of the above incorrect?