Years ago I made an aluminum rocking tube bridge(prototype) for my Tenn Rose. It was thick wall extruded tube that I formed to 12" radius with the compensated saddle string breakover. I didn't do an A-B comparison but it sounded great- a clear balanced tone. Time allowing I may make one for my, yet to be acquired, 5420. I tried all sorts of ideas for a 12" radius finally discovering that LP records are 12"..haa. I may have a pic somewhere.