Plastic repair update

I'd try Sugru.

NOW I see what is going on.

Is the shaht solid? If it is here is what I would do.

Remove the other lug.

Fill the entire top of the knob with car body filler.

When set drill through it and into the plastic shaft of the other bit and put a couple of small self taps in.

No the shaft isnt solid, but I could either fill the shaft with a dowel of some sort or maybe a resin and then put a self tap in.

Yes. I think the more phislophical mesaning I was trying to convey was:

"Stop trying to put it back like it was, and think instead of what function it has to fulfil, and what available solutions you have that would meet that, even though they bear no realationship to the original design".

Like the time when, faced with a corroded PCB coinnectoor and circuit board in the te freelander passenger lights, and the dealer said 'new light unit and loom, as that connector is not available on it's own'....and I thought, said 'sod it', parked by an outside power point, plugged in me soldering iron, cut the connectror off and soldered the wires directly to the PCB....

A 'merkin would have said, "sodder it"

Yes I already deduced what it was from your inadequate photos and zero description, and looked for a purchasable replacement part without success. You now have to post photos of the hidden faces of the parts if you want proper advice. Why is the knob bottom left in your new photo different from the one top right, and has lugs but no ramps? What does a lug look like from the side?

Because one has the the 2 parts linked and the other doesnt. But no worries I am going to buy a haynes manual on repairing Kirby carpet cleaner water tank valves that should solve it.

Youtube is a lot more informative on repairs IME.

NT

Remove the remaining tab and clean up the surface. Get a bit of square steel bar (door knob spindle?) heat it up and press it in so it makes a socket for itself. Assuming this is a thermoplastic you're dealing with, of course.

Keep it all in one thread?