Re: Parallel Axis Trembuckers.
Standard trembuckers are, parallel axis trembuckers aren't. One thing you could do is send in a pickup to be rewound to the specs of a parallel axis pickup. One of these days, I'm going to send in a covered humbucker and have it rewound to Blues Trembucker specs. There might be a small difference in tone due to the polepiece design, but a covered standard trembucker rewound to the specs of your favorite parallel axis pickup would probably get you 90% of the way there.
Ryan