4 studs came out with some effort. One has sheared in the head.

Some comfort that it's one of the central ones that had to come out - I'd be kicking myself if it was one of the outer ones.

I reckon there's sufficient room to attempt a drill out and possible clean up or helicoil in situ. If it's proving difficult, I'll whip the head off.

"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10