FranC, the TFSR link that Joe posted is great. If you want a video you can follow along with - one or both of these may help:
https://www.youtube.com/watch?v=guYToL6Gegs - On Machine dis-assembly and reassembly of the tensioner
https://www.youtube.com/watch?v=kzFXRdNE_1s - Off Machine dis-assembly and reassembly of the tensioner
The only thing that's a little different from these videos on a FW or a 301 is the "2 setting" I mention toward the end of the video works for most full sized tensioners. For the smaller tensioners, like the 301 and the Featherweight, I find that the setting is full tight when the post is flush - between 9 and 10.
This comment makes a lot more sense in context. If you watch the videos, you'll understand.
