Simple extension for a flat toggle switch that is 31.5mm long. The toggle switch this was placed on is 5mm at it's widest and 12mm long. Since it's a V shape toggle, if you move it left/right it will rock some but otherwise it's a pretty tight press fit and flipping up/down will generally not have it move side to side.

I recommend allowing them to cool on the bed for a few minutes. I found when I pulled them off immediately the fit was too snug.