Restringing Rotor valves

[jmh3412]

Hi just inherited a bass trombone, which needs restringing. Any ideas of the best way to go about this?

[Untersatz]

Good news, this one does have a video !

http://www.youtube.com/watch?v=UyxcIWzpxB0" target="_blank" target="_blank

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

[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.

[windshieldbug]

Barrel knot:

http://www.tyeenandmaz.com/?page_id=1843

[burningchrome]

None of these detail the profuse cursing one must perform when the string slips out of the swing arm screw.

[Kevin Hendrick]

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 ...

[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.

[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.