Pauls Comp . they are Made in Chico Cal ,
rather than rely on the bushing fit on the frame boss, they supply a Stainless Steel Sleeve over it,
that gets fixed, then it rotates around that piece
they have control over the fit interface & design adds O ring seals.

the brake shoes they use on those is V Brake type, so Toe In can be done .. easily.

its coil springs are tensioned individually back winding each, for balanced return .