I got the US 007 chassis in this evening, and made short work of mounting an Orion 3600 into the problematic low COG 007 chassis. First order of business, remove the useless humps from the pack. I've seen several pack chowed badly trying to use the humps in slots, too much slop and no weight where it's most effective...in chassis slots. A careful disk grinder removed them in less then 10 minutes.
Next right rear bulhead. It intrudes into pack area on all Lipo's I'm aware of. The first pic shows the relief cut on the bulhead...again disk grinder or dremel..another 5-10 minutes and pack now slides in, and screw still threads...lightly with blue locktight.
Next-- center up pack in chassis, keep pack as far to out side as possible to reduce amount of required weight to balance, put in chassis inserts on ends, bonding with good quality servo tape, or your favorite adheasive, make sure pack is centered and removes properly, then finish remaining inserts.
Last using the adjustable stainless weight, adjust to proper amount of weight needed (universal weight adjusts from 3.0oz to 4.75oz in concealed channel extra weights included), put on thin strips of servo tape at ends and center, press on and your done.
These base inserts put 1.2oz of weight where its most effective, totally lock the battery from movement with just enough to avoid tweak and removal. The Orion 3600 is a light pack at 7.7 oz, we quiclky got it to 14.0 oz. I will be mounting up the electronics and doing final balance this weekend, and expect a small amount of chassis weight will be required with this lighter pack. The new SMC and Reedy pack are same thickness and should mount the same way. They are 5000 mah so will be aound 2.0 oz more...less weight to add.
Enjoy the pics...and link at end where to get the weights. These are top quality stainless steel weights that will not corrode, dent, and polish to a brilliant shine. The quality look and performance your Xray deserves.