So how do you know where the felts hit the strings if you wanted to make a new chord bar? I know what notes on the piano build all the major and minor chords, but when you cut the felt and glue it to a chord bar, how do you know where to cut? Do place the felt on the strings and make marks to know where to cut and where not to. I like the idea of making a B5 power chord, then you could use that for aB minor or major.