Purely in the interests of self promotion, may I humbly offer my wares...http://web.mac.com/petersumner

Happy to send one out on appro

If you need a reference you could ask Taylor from Chico...Steve Forman (an excellent maker now in Scotland doing research)...Mickie Zekeley et al...

14 16 18" diameter tunable....

Happy hunting
Pete Sumner
Redwood City
California