I'm sketching out some fanned fret designs and am stuck on the bridge. Aside from the individual tailpiece/saddle combos, there isn't much else on the market I can work with. So I've been spending more time designing bridges than anything else and have the following stupid questions.... 1. Why do I need adjustable intonation? Once it's intonated correctly will humidity, temperature, age and normal use really have that much effect? After all, the frets don't move, the nut doesn't move, the scale doesn't change, why should the saddles? 2. Suppose I fix a non-adjustable bridge to the body (a la violin, archtop, or similar instrument). Would glue provide a sufficient acoustic coupling for maximum sustain? Or should I use wood screws? Threaded inserts? Mortise & tenon? Does it even matter? Thanks, m.