Lots of interesting stuff there Luddite but bear in mind the indisputable fact the the linings when new are thinner on the trailing shoe than on the leading shoe, so one could end up looking for a problem which doesn’t actually exist.

Doug
2011 Plus 4 in Rich Maroon

1972 750 “ComDom” sprinter
1958 Triton 650
1992 Triumph Trophy 900