I have some variable scopes that almost require pliers to adjust the magnification. Very stiff and slow. Lots of new AR scopes have throw levers, making that task faster and easier. I wrote to Leupold and Burris to ask if they make an after-market lever. Burris has not responded and Leupold does not make one and referred me to MGM Switchview. Have any of you guys used these? The reviews are good. But, they are expensive, $90 on their website. Optics Planet sells them for a lot less, about $65, but the selection is quite limited. I'll appreciate your thoughts. Functional? Ease of installation?