Assembly Video Product Description Adjust the balance of your Glidr Bermuda trainer with the Zippy blade insert and spacers. The spacers remove end-weight, while the insert adds tip-weight. Together, these mods provide a far more neutral balance profile for the Glidr Bermuda. Features More neutral balance: Blade inserts add up to 6x removable tungsten weights to the blade to reduce the handle bias. The weights can be popped out with the tip of a ballpoint pen and can be popped in with your thumb or any rigid flat object. Spacers shave off 0.11 oz from the ends of the handles for reduced handle bias. A pair of Zippy spacers weigh 0.050 oz. For comparison, a pair of stock spacers weigh 0.160 oz Spacers feature positive jimping for extra grip on ladders. Insert fits securely and won't fall off on hard drops. Made of shatter-proof polyurethane. The Zippy Insert Mod adds 0.043 oz without weights, and 0.171 oz with all 6x weights. Add-on optional Zippy Slim Caps for only $5 (30% Discount) to protect the handles of the Bermuda. Assembly Instructions If you have trouble inserting the mod, try to pop it in without the weights, and then equip the weights when the mod is already installed in the Bermuda. To install the spacers, simply unscrew the T8 screw at the bottom of each handle, pop out the old spacer and black metal pin, pop in the Zippy spacer, and retighten the screw. If you are having difficulty unscrewing the spacer, alternating time in the freezer and in boiling water can induce thermal contraction/expansion that loosens the factory overtightening. My Bermuda required approx. 2 hours in the freezer, followed by 2 minutes in boiling water, after which I immediately attempted to unscrew the T8 screw at the base of the handle.