On the picture today you can see how Victorinox recommend replacing handle scales. There are other ways to do it and if you have strong fingers you can press them on. If you use a vice because that
is the best way to do it, because it will give the best press fit and it will make sure the bushings are well placed inside the three attach areas on the scales. Make sure to keep an eye on the corkscrew if you use a vice and to glue something on for a protection
over the jaws grip areas on the vice. I use a wood vice with some fabric on. I start with placing the two scales over the bushings and place one side with the corkscrew open, then the next side and I finish with placing the entire SAK inside the vice so the
center busing attaches. It is also possible to start with one end, then the center and finally the last end. Always place both scales on.
On the picture you see how to remove the old scales.
It is also possible to use a thin screwdriver into the toothpick/tweezer openings and do a small bend and the side will pop open.