Does that fix work on a cheap door mat or does it have to be a posh one

Maybe the rubber bonding is splitt apart, rattles when cool, the as it spins the 2 rubber coated surfaces get hot and tacky and improve the drive.
Maybe.
Look for a how to fix etc link by author (me) it shows how they can fail.

that's the one, thanks bob

Don't know how to post links via phone but of you search service and windscreen and washers by author northern bongolow you will get a how to with pics on how to strip and clean etc.

Usually it's the plug on the back of the bulb, try that first.

I wonder what the Speedo would read with them on.

Front crank pulley ?.

I cannot remember right but looking at the pick I don't think they would put a rubber hose just inches away from the exhaust, so I think it is a bodge repair to the steel pipe that maybe should be there, that's why you poss cannot locate the hose.
Just guessin.

It must be one of those rare cared for none rusty underneath bongo,s.
It must be worth 2 k more than the others.lol.

Do the job while it's well supported but in the air, then do the final tightening while it's on the floor.
Support well as your under the middle and will be pushing and pulling.

Rear bushes can be pain, and need tightening when the load is on the suspension. Getting them off can be the problem, one of the bolts goes through so if it breaks it can be replaced easily, the other isn't and can break off and need drilling out/through to put a new bolt in. Lube with a release age...

Try it with the fuel cap loosened.

That's what I did on mine before I went stainless, a good spray up when new with high temp paint, it did last a tad longer but not by much.

Just guessing, is it on the throttle peddle, not had owt to do really with the new ones. Lol.
Or that little box on the pump pictured may be a modern equivalent.

Just to be accurate,
Was it a wide rose for two to stand under, or a partly blocked rose that took a while to empty or a very large can.