Oze, on both slipjoints that I posted the bolsters are silver soldered on to the liners. After they are soldered and shaped to the liners the scales are added and shaped. After many try fittings, the liners with bolsters and scales (bone, wood micarta, whatever) are hammered on to opposing sides of the spring and blade using pin stock. If I had a mill I would mill out the area where the handle scales attach. If you aren't experienced soldering the bolsters, search this forum for an old, I mean 5-6 year old, post by Bill Vining where he provides instruction. Frankly, the process is a pain in the arse. Stainless steel is hard to solder and you must use the correct flux. Here we use 'Sta-Brite", I think its called. Later, if I got the name wrong I'll correct it. Dinner time now!