Those are great! I still have a handful of vintage lawsuit acoustics, with an adjustable bridge as well. Interesting story. I still have the first I bought back in the eighties. Early 70’s Washburn W250 D28 copy. Best sounding of them by far. So I cut cut my teeth on guitar work by servicing guitars for the guys in my bands back in the 70’s, I had never seen an adjustable bridge befor. So I got the Washburn. I took the adjustable bridge out to investigate how it works. When I saw how the steel piece had a radius bend at the bottom, I thought it was broken, defective, or someone bent it. Certainly if its not flat to make contact with the wood, why that’s no good. So I spent hours working with it to try and straighten it, to no avail. That steel was hard. So I just put it back in and played it till I found out later on, that’s how the were made, to rock from side to side, ha! I never told anyone that story for many years, how embarrassing. I’ve made thin saddles for mine out of dry light weight bone stock, with radiusing the bottom to touch the radiused steel slot from side to side. Years ago I took one out and made a fat saddle to replace the whole adjustable piece. Sounded awful so I learned to just leave them alone. Enjoy the D55..ish!!