Mk1 Mini Handbrake.

I thought all mini quadrants pivoted, and the two guides on the rear subframe where the only ones the cable slid through Fitzy

My memory of the quadrants, (may be different on the earlier ones) is there is a 'bullet' crimped onto the cable that locates in the cut-out in the quadrant and the ends of the quadrant are only slightly crimped at each end to prevent the cable from falling of it when slack. The pivot regularly siezes with rust/road grime and needs to be worked loose with WD40 or similar.

I think all mini hand brake cables had barrel shaped locator, but the crimping was close to the barrel, (either side of) rather than at both ends of the quadrant, Fitzy