The instructions were simple and clear enough .. i think there may have been an error in the instructions regarding where to use the lock nuts versus the regular nuts .. i diverted from them and followed my own logic .. the angled flange on the support base clearly intended that the support base be mounted at the rounded corner edges of the spa .. although the pictures in the instructions and web photos show it differently .. the angle of the pole when open made me a bit nervous about the fit, so i made the first attachment on both sides with a single screw in case i needed to re-adjust .. and tested it ... it was perfect for my spa .. 

And i was pleasantly surprised by how easy it made the whole job of getting the spa cover off and back on too . Would definitely recommend.