It looks like you are using an ad blocker. That's okay. Who doesn't? But without advertising revenue, we can't keep making this site awesome. Click the link below for instructions on disabling adblock.
They say that 3 mounts is the mas before a ski loses it's structural integrity - I personally think it depends where the previous mounts have been. If the holes haven't been too close together then mounting a ski up to 4 times is doable, but generally if the hoes have previously been quite close then 3 times is about the limit.