Jack FFR1846
Well-known member
IMHO - the best overall upgrade for a Sub 1 is to slap a Silhouette Special loaded original pickguard on it. The old Silo interchangeability trick.
Locking tuners would be something to consider too.
~Jim
The trem equipped ones have locking tuners (use a big screw driver). Not Spertzels but they do the job.
jack