vintage German tremolo for my Kawai guitar, which is prety similar
to Kahler, as I understand. It's only problem is the spring, which is pretty weak
and doesn't really hold the tension, so after moderate use guitar gets outta
tune. Spring itself is narrow, so I have no chance to replace it by Bigsby one,
and even spare narrow spring for my Hallmark tremolo has a little bit more
larger diameter than needed. So the question is whether it's possible to
find something like Bigsby spring but like two times smaller. Maybe some
motocycle part would work? I qonder if anybody had some experience,
as I know Brian May managed to work it out when he built his Red Special

Thanks in advance
