If they are for rails/urban you will be fine. Remounting does weaken the skis core. It is said a ski can take up to 3 mounts before being completely unridable. If they are just your rail skis, you dont really need to worry about the skis core weaking and also weaking the flex...and usually you can get a mount for free from the shop guys, but if not it will run you around 10-25 bucks, depending on your shop.