Many players magnetise their models to have an option to change their weapons. But even if you're a hobbyist keeping faithful to one model configuration, you may benefit from magnetising some parts
1. Resin/finecast miniatures are notoriously fragile
I made the lance arm of this knight magnetised so that it breaks loose before it breaks in half.
2. Even some plastic models have poses that make them break easily
Swords are thin and thus difficult to pin. But you can magnetise the entire arm.
3. To make the process easy for you use magnets to hold magnets.
Magnetising is really easy:
Extra tip: I keep the polarity consistent across my entire model collection so that I can potentially swap weapons or bases between models.
4. I also magnetise elements that stick out and make the model difficult to transport, like the banner pole on the picture below. Note that models in the cart are on normal bases and are removable as well: