I machined a threaded insert for the shaft and machined a couple threaded inserts for a length of carbon fiber for an extension. I machined a weight out of solid aluminum round bar and bored out the inside to add weight and machined a threaded cap for the end of the weight and powder coated it black. I added 22oz. of lead shot inside the weight, it balanced the EQINOX 800 with the stock coil almost perfect...it definitely makes it better to hunt with now.....