It was tough cutting through the arc of the knocker so that the intonation was spot on and so the low E
hangs solidly...it works.
there's a spring around bolt supporting the upper part of the knocker...then goes through the body.
The abrasive surface of the rock wedges it up to the proper height and holds it solid (allows the sitar buzz to be adjustable a little ...but of course then the intonation changes minutely).
what it needs is a treble roll-off to prevent tinnitus after loud jams ...still its a good prototype of an idea.
I can now sell my italia sitar-thing.
thanks for the comments...I'll post pics of some other interesting things I've done soon.