Offsets with the tremolo are similar to a trapeze-bridge setup. The only difference is that the tremolo rocks the bridge so the intonation stays accurate. The bridge is not fixed hard into the body on an offset, rather the bridge pins are pointed and rock inside a bevelled pocket within a body dowel pin. The bridge pins are usually wrapped in a rubber / neoprene tube, to prevent excessive movement and to provide some cushioning. It's not a lot different to a standard tailpiece setup, or a bigsby, the only difference is that the bridge pins are not fixed, they are semi-floating or 'pivoting'. The advantage is the strings are not rubbing through the bridge saddles, the bridge is moving with the string. Getting the initial intonation setup on an offset can be problematic, but once set correctly they are stable and reliable. Most of the complaints from offset owners is due to the crappy fender bridge offerings. be it the original beehive type or the mustang type, both are flawed. Of the custom bridges, staytrem, mastery and truearc serpentune are probably the most popular. I prefer the Staytrem due to it's rigidity and adjustability. It also corrects the string spacing issues that offsets have, and has a much more solid and correct radius profile and saddle width.