B5 or B7 — decide by body shape
The B5 is a flat-mount vibrato for solid-body guitars (Telecaster, Les Paul Junior, SG). The B7 is a semi-hollow / arched-top model with a front pivot hinge that lifts the string over the top bout. Putting a B7 on a flat-top will look wrong and often creates a break-angle that is too shallow over the bridge. Putting a B5 on a semi-hollow ES-style body flexes the top under tension.
What to upgrade on a Bigsby
Most of a Bigsby's tuning-instability problems are not in the Bigsby itself — they are in the friction points around it. The nut, the bridge saddles, and (on a B7) the tension bar each contribute. Fix them in that order.
Nut: graphite lube or a graphite-impregnated bone nut reduces binding.
Bridge saddles: a roller bridge between the Bigsby and the nut removes the single biggest friction source.
Tension bar roller (B7): swap the stock bar for a roller bar so the strings move freely over it.
Pivot screws: replace worn pivot screws with fresh ones — this alone often solves return-to-pitch slop.
Fitment cues Aumsen asks for
Before we quote a roller upgrade, we need three numbers: the Bigsby model (B3 / B5 / B7), the tension-bar length (if present), and the existing pivot-screw thread (imperial 10-32 or metric M5). Send the model number on the plate and a photo of the rear of the unit — we respond within one business day.
Frequently asked questions
Do I need to drill new holes to upgrade to a Bigsby from a hard-tail Tele?
Yes, a B5 uses three studs and a set of mounting screws that do not line up with the four-hole pattern on a Tele. Drilling is unavoidable on a factory Telecaster body.
Will a roller bridge change the tone?
Slightly. Rollers have a smaller contact patch than fixed saddles — attack stays similar, sustain drops very marginally. The tuning stability gain is almost always worth the trade.