TromboneChat

I recently acquired a Jinbao 42BO wannabe from the classifieds here (thanks, Steve) and have spent considerable time cleaning and getting the slide and valve working pretty well. It also gets a pretty good sound with little effort, IMO.
The problem I'm having is with the placement of the f-attachment lever. It is too low on the bell brace, so when I activate it the lever hits against my palm. I have to shift my whole hand to get the rotor to open all the way.
I'm hoping for a solution that is not costly or extensive. One thought I have is to unsolder the lever and re-solder it higher on the brace, thus changing the angle. Is this reasonable? Will it work? Being a Chinese-made horn, can it withstand getting re-soldered? (This would be done by a repairman - not DIY)
My other idea is to flatten out the lever itself so it does not bend downwards toward the handgrip. In comparing it to my Bachs, the Bach is flatter so the lever is higher.

Go ahead and reach out to a technician. You pay them so you dont have to think about it

This may help clarify what I'm asking. Jinbao v.s. 42BO.

You may be able to adjust the turnbuckle rod connecting the trigger to the valve to lengthen the rod, which will move the trigger closer to the brace. If it isn't a turnbuckle, it may still be a quick job for a tech to adjust for you.

Thanks, Bruce. I did think to try that by removing it to see if it was adjustable, but it is not. Even if it were, I don't think it could be lengthened enough to make a difference..

I had a similar problem on a Conn 112H but in the opposite direction. The saddle itself needed to be moved. It seemed to be quick and easy work, but I’m not a tech.

Instrument Innovations has some nice parts that can be used for things like this (though they may need some adaptation for use on horns other than ones they're targeted for). I just dropped off my Chinese bass this morning for the Gb valve linkage to be upgraded.

You just need to lengthen the linkage rod between the lever and the connection to the stop arm. It will bring the disengaged lever position back towards your left shoulder. However the “throw” distance will not be as short as the other linkage photo. You would need to extend the lever farther (the length of the ball and socket) in order to reduce the throw.