Piggy back weaver mount?

[gilfo]

Does anyone make a piggy back weaver mount. What I need is a weaver mount that can attach to a weaver mount. Hope that makes sense. I have a scope with a weaver mount attached to top but I can't add a optic to it due to the adjustment knobs, so I would like to attach another weaver mount on top of it and add the optic.
Thanks

 

[rcmodel]

A standard scope riser block should do what it sounds like you want to do.

http://www.opticsplanet.net/leatherwood-hi-lux-riser-block.html

http://www.yhm.net/store/rails.html

rc