Wah inductors can be tuned

[alfafalfa]

Yesterday I posted about my findings with a selfmade inductor.
I had a steel bolt through it and  people here advised me to get rid of it. So I had to remove the inductor from the pcb board. When I measured the coil again it read only 200 mH so the influence of the pressure of the bolt  on the potcore was rather big.
I put in a nylon bolt and put the inductor back on the board, tightened the nut and this tightening gave me the possibility to tune the inductor!
I use quite a big pot core :http://www.esnips.com/doc/b72b0b17-ac98-4c24-ab6b-e1e351fdc861/inductor-open-1-small.jpg
Don't know if it's possible with smaller ones. Thought this could be of use .
I will try to make a board with 2 inductors , tuned differently, and switchable.

Alf 

[DDD]

1. Very unstable (inductance wise)
2. Ferrite is very brittle material, be careful not to damage it.
3. Switch (and adjust) capacitors - it's much too easier.