Roofing nails.....lots and lots of roofing nails. But if that doesn't work, go to a shop where they know what they are doing. People really need to stop asking how to do this themselves. If you have to ask, don't even think about doing it. This isn't an easy build a cheap wooden desk with your own two hands project. Take your know how to use a simple drill, Bob Villa idolizing self, to a shop and make your ski/binding investment more than just big paperweights. Oh ya, and it will also really help with keeping you out of traction.