Once you have your camera and accessories on your scope sometimes depending on what accessories you have no matter how far forward you slide the scope on your mount you cant get enough weight to the front of your scope so you can't balance it.
For example if you take of your dew shield you may find you cant balance the scope...these weights counter act this providing adjustable weight where it is needed.
It slides onto the Bottom Losmandy D series dovetail plate the one that connects to the mount saddle.
I hope I explained this properly...lol
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