I then purchased sheets of brass and cut out the wedge-shaped tangents. For the lower 11 bass keys for the 22 over-wound strings the tips were folded over so they didn't get caught between the copper overwindings.
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I drilled a small pilot hole and clamped them to make sure they didn't split the thin delicate key ends. It was a little nerve racking but no major problems!

A few years back I remodeled my 1950's house bathroom and removed the lead toilet pipe. This old lead pipe I then melted down with a blow torch and made some 1/4 inch lead rod which was then used to add some back weight to the keys. The toilet never sang like this!
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Phil