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Wanted: Tek 577 Step x.1 knob or a sketch for 3d printing


 

Dear all,
I happened to destroy this knob while trying to fit it in.
It broke in dozen of pieces so it is impossible for me even try to glue the pieces together to allow me to draw a sketch for 3D printing.
So I am asking the forum for a sketch, since it seems this knob has been an unobtainium part since a looong time ago.
Thanks to all.
Roger