We think alike. I use a business card and eye in the saddle position for intonation and also adjust the saddles for radius using a radius gauge. I have to confess that on one bridge I got the saddles positions, height and radius 'almost' perfect. The intonation and radius required the tiniest of adjustment once I set the action and adjusted the truss rod. I'm never too far off but on this one occasion I was so, so close! BTW, I wish we had a McMasters Carr on this side of the pond. I can get every conceivable metric size but I'm really struggling on Imperial. I do have some 6-32 grub screws but I can only find Gavin at Axecaster who stocks them as an extra for his vintage saddles. Anyone else in the UK know of a local supplier.