The Renault has always had a slipping clutch sine we restored it. Unfortunately the best way to change was an engine out job. Pictures below. We opted for a partial remove and changed clutch and pressure plate in situ. I managed to get all the parts off the shelf still wrapped in wax boxes with the army number on it..lovely piece of history! The pressure plate has removable spacers on arms..
This only became evident when we tried to fit and the release arms were woefully short! So top tip..remove all packaging before fitting!
The old clutch was basically dust so had been slipping for years. I was disconcerted that the release levers were all preset to different heights. .I felt sure they would need to be level..but hey Ho there's only one way of finding out...
It's all pretty straight forward but you must align clutch perfectly or the engine will not go back in. Our clutch was mm out and without a clutch alignment tool and trying to in situ was very time consuming. We found using over length bolts in bell house was the way to draw then engine on to the gearbox input shaft.. very fiddly. If I was doing again and didn't have a clutch alignment tool I'd take the engine completely out the vehicle. . Next job reassemble and see if those pressure plate legs work even if they are set at different heights. ..fingers crossed. ..