Blunder wrote:
Still would like some close up snaps of a good condition roof with sliders etc...
I had a 1275LS with the same sunroof as they used on the sunshine.
Sorry will be hard to see detail. The rubber seal which pressed against the glass was hollow. When the button on the dash was pressed it applied vacuum to the seal (the engine needed to be running as there was a connection to the manifold) and it collapsed, this allowed the glass to slide. There was one way valve so the seal slowly returned to normal and helped hold the glass in the open position.
It was actually a very clever design and didn't leak, at least mine didnt. Was fantastic in summer.

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68 Morris Cooper S Mk1 (*ex 78 1275 LS 4th last built, 70 Morris 1500 OHC & 70 MiniMatic)