Iris and I worked cleaning on Mr. Ed's tension. The 319 user's manual was incorrect on putting the tension back together - at least we kept it in order when we pulled it off - it is still crooked though and that will drive me nuts. I looked up more information so we can set it in right - of course, I haven't done it yet - but I like to look up how to so I can get it back together. Anyway here is some information on tensions.
http://vssmb.blogspot.com/2011/07/do...sion.html#more look under #2 refurbishing - tension mechanism then look for a tension that looks like your machine's tension. This blog was helpful as well
http://vssmb.blogspot.com/