Do we think a stock Mustang bridge is convertible ? Or do you need to start from scatch ?
- nylon post bushings - presumably available from engineering shop suppliers. Fender put them on the Marrguar.
- 52mm E-E spacing - there are already aftermarket 56mm Mustang bridges with excess space between the saddles. Squeezed together they would come close to 52mm - you only need to gain 0.8 mm per inter-saddle space to get from 56 to 52mm.
- re-drilling intonation screw holes for 10.4mm spacing. Easy with a template. Someone suggested doing that on the other side of the bridge plate here the other day.
- 9.5" radius - requires filing the string grooves on the stock 4 middle saddles down, or flatten the underside, by the correct fraction. Easy with a file and digital caliper.
- tighter thimbles - Fender already puts a nylon anti-rocking flanged bushing / sleeve bearing into the top of the thimble on the Am Pro. Presumably available from engineering shop suppliers.
- nylon washers on the intonation screws - available on ebay from China
Perhaps the only thing that would be more difficult is the offset placement of the intonation screws. That would require new saddle blanks, drilled offset from the string groove. But the stock intonation screw placement is not a huge hassle, especially if the M3 screw is 16mm instead of the too-long 18mm screws on some aftermarket Mustang bridges (keeps it away from the string).
I share the scepticism re Fender ever licensing the Staytrem. Which is unfortunate, as Fender probably has most or all of the above parts 'off-the-shelf' in their US factory for existing guitars, to screw together a Staytrem-clone tomorrow.