Humayun, the wedge is an absolute necessity, some people build their own, there is a design for a wooden wedge (plywood) in the files section of the yahoo LX90 user group; IIS member (philip) 5ash has built the wooden wedge and posted here
http://www.iceinspace.com.au/forum/s...ighlight=wedge . I'm still to fire a shot with my system, I still have a few bits to collect, but I have the Bintel weight system and IMO it is good value for the money, but I suspect that I will need to make some additional weights.