Sometimes one needs to exchange pole tips: when a tip is broken, damaged or worn out, or when the tips are not hardened or otherwise unsuitable for roller skiing. The old way of doing this is by heating the tip in hot water so the glue softens and pull the tip off the pole and replace it with a new one. In recent years easier systems have been introduced where heat and glue are not necessary, at least not every time.
Most of them use a screw mechanism where one either screws the actual tip onto an adapter glued to the pole end, or screws a nut around the pole shaft down onto (or into) the upper part the tip. The brands using these mechanisms are Fischer, KV+, Leki, Swix and Skigo. Two brands, Exel and Rex, use a quick lock system where a little tab in the pole tip holds on to a little ridge on the adapter.