Wadia 21 Preamp Adjustment

I've just aquired a Wadia 21 which
I'm delighted with.
Do any of you know if you can adjust
the pre-amp output on this model
(never gets aboce level 2 out of 5)
and if so how you do it ?
Any good tweaks or ancillaries for
this player ?
You may want to contact Steve Hurley at Great Northern Sound Co.
He specialize in Wadia (worked for them) and have modifications for several models.