Have icespiker tyres with missing spikes.
Have replacement spikes.

But how do I fit them?
(The spikes are like a mini-drawing pin, but I can’t work out how to fir them into the wee hole in the rubber stud)

And then I have my city spikers to re-spike.

Cheers!

didn’t you get the tool ? they just push in with the tool/

spikes and tool are 10.19 on rosebikes atm.

If it’s similar to the Marathon Winters, hold the stud end with pliers & bend the tyre to elongate the hole. Now push in part of the stud head to the hole, like a button in to a buttonhole, & then twist the stud to get the whole head in, loosening the tyre bend. Took me a few minutes to get the knack, then the rest of the studs took seconds.

It’s dead easy with the spike tool- put spike on end, poke into tyre. Nothing you couldn’t recreate with pliars but I’d rather not tbh!