Passive Break-In Device

Greetings!

Some clever person here (and I can't remember who) made a passive
break-in gadget from a cheap Radio Shack speaker and a clothes-pin
(IIRC).  I am about to do it one better (I think).  My thought is to
file a flat surface on some of these cheap plastic bridge pins I have
so they will sup****t a platform (thick veneer) CA glued to the pins
and a cheap speaker driver glued to that.  In my mind it should work.
Whether it actually improves tone I don't know.

Did I miss anything?

Best wishes,

Dr. Jim Lowther