key bushings

[Newton Hunt]

> Okay, now I don't know what you are talking about. I thought you were
> talking about folded-over vs. flush trimming ... but this paper analogy
> talks of strength and holding shape ... I don't get it. Alan Barnard

Being folded and glued onto two surfaces gives the combination (wood and
felt) extra strength to prevent bushings from curving inwards (toward
the pin) at the ends of the mortise.

		Newton