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Restringing Rotor valves
Posted: Sat Jul 13, 2013 9:49 pm
by jmh3412
Hi just inherited a bass trombone, which needs restringing. Any ideas of the best way to go about this?
Re: Restringing Rotor valves
Posted: Mon Jul 15, 2013 12:30 am
by Untersatz
I got NOTHING at all from watching this video.........retarded!!!
I understood completely what Joe said, but that video is totally useless!!!
This one actually "explains" the steps performed & what all the parts are & what they do....
http://www.youtube.com/watch?v=hx3-zNotyT0" target="_blank
Re: Restringing Rotor valves
Posted: Mon Jul 15, 2013 10:10 am
by Dan Schultz
Courtesy of The Allied Catalog:
Plus... I always 'stiffen' the unknotted end with super-glue so it will thread easily through the holes in the lever arm. Also... the knot is what they call a 'barrel' knot. I don't have an illustration for that but I'm sure you can find it somewhere on The Web.
Re: Restringing Rotor valves
Posted: Mon Jul 15, 2013 10:34 am
by windshieldbug
Re: Restringing Rotor valves
Posted: Mon Jul 15, 2013 11:19 am
by burningchrome
None of these detail the profuse cursing one must perform when the string slips out of the swing arm screw.
Re: Restringing Rotor valves
Posted: Mon Jul 15, 2013 12:26 pm
by Kevin Hendrick
burningchrome wrote:None of these detail the profuse cursing one must perform when the string slips out of the swing arm screw.
That part quickly makes itself known ...

Re: Restringing Rotor valves
Posted: Mon Jul 15, 2013 1:06 pm
by Lee Stofer
To make this a long-lasting repair, I would seriously suggest that you get some Yamaha french horn cord. It is yellow, and basically bulletproof. With the Yamaha cord, it is not necessary to super-glue the end. Simply cut the end of the Yamaha cord at a sharp angle, and you will have a point good-enough to go through the smallest, most difficult opening on a valve lever.
To string a valve, I start by knotting one end, inserting it through the lever and then making a figure-eight around the stop arm. I leave the screw on the stop arm loose until everything else is tightened as that allows one to remove all play in the cord while tightening. Then, the lever height can be adjusted by moving the lever and then tightening the stop arm screw. I run the cord under the cord already in place as I thread it towards the other end of the valve lever, so as to avoid the cord rubbing against itself as the valve is moved. If you thread the rotor and the cord starts rubbing as the valve is depressed, then change the routing until it does work. Experience is a great teacher, and if you stay with it, you'll learn the process once and never forget it.
Re: Restringing Rotor valves
Posted: Tue Jul 16, 2013 9:51 pm
by LJLovegren
In college, I got to use a bass trombone owned by Robert "RIP" Posten. Most of the valve linkage had disappeared but it operated fine with a rawhide shoelace tied to the remaining mechanism with a loop for the thumb.