cazpar

I just received my Digital Altimital, the high altitude model, but im sure most digital altimeters are the same for this part, my question is, how to i put it on the hand mount, from what i understand from looking at the pictures i just poke 4 holes for the screws to go through, but im not sure and i don't want to mess it up, so if anyone has one or something like it and knows what to do, any help would be appreciated, thanx.