The project trombone that I worked on was a Cleveland/King. This was the first instrument I have worked on that had ceramic lacquer. This inspection was simple because there weren't that many things that needed to be fixed. It needed a chemical flush, had a bell fold and severe crook/guard dent. The slide worked pretty well it just needed some slide alignment. My instructor gave me some more dents to work on in the main tuning slide crook, gooseneck and bell.
My project trombone
Chem flush
Before the chem flush I did a pre-clean of the slides by swabbing them out with cheese cloth, valve oil and denatured alcohol. Also before submerging the trombone I took off the balancer so that the company sticker would stay intact. I put the trombone through the detergent soak and phosphoric acid but the out slide tubes were still full of lime and scale. To get rid of that I plugged the waterkey chimney with cork so that I could put muriatic acid in the slide to soak. I left the muriatic in the tubes for 15 minutes.
Pre-clean using a slide swab rod and cheesecloth
I took the sticker off the balancer with a heat gun and a razor blade. I then could reach the screws that held the balancer on the brace
The plugged waterkey chimney so that the muriatic acid wouldn't leak out
Dents
The only major dents were the bell fold and crook dent.
Bell fold
Main tuning slide crook dents that were put in. I put in the dent balls and tapped down the displacement then I drove the dent balls further until the dents were gone
The finished main tuning slide
Crook/guard dent. The guard was pushed in to the crook
