How can you improve on the TX/PS innards, apart from going down to 23/24mm bore and shortening the stroke and may be using delrin guides (especially...
Lots of things, how about a silent ABT for the 77/97, an improved lever set up for the PS and a one-piece tube for a short TP with no leaks for both...
Definately an odd one then, my reach forwards 23mm have different screws as you say but this miss matched pair have the same size for all screws top...