I should be grateful for some help here.

This shop vac had served me well for many tears until recently when the motor cut out momentarily shortly after switch on and I noticed a tiny bit of smoke at the site of the external on/off rocker switch (I hastily switched off).

I dismantled the machine and tested the motor by connecting directly to the mains; this seemed to work OK.

I then tested the switch with a multimeter; in the on position both pairs of contacts measured nil resistance.

I don't know how to test the capacitor but could see no obvious sign of failure. This component is rated at 275VAC and 0.22 µF; again, I don't know the type of capacitor concerned. I assume that the capacitor, which is wired across the switched side of the mains, is there just to prevent electrical interference ie not functionally essential (although I would not wish to upset the neighbours).

Can someone with relevant expertise comment, please? I think I may be able to locate a suitable replacement switch on eBay where there are also capacitors to be found but I am not sure how to specify the latter.

Incidentally, as this is an essential piece of workshop equipment I have today bought the equivalent new version but am reluctant to add the old one to landfill if it can be repaired.