by "better" I guess you mean higher power. Just add an extension tube to your existing 2x barlow and you'll have higher power. Some technical details if you're interested, here: http://web.telia.com/~u41105032/barlow/Barlext.htm
Thanks Steve, but it makes the dynamics of the scope awkward, and puts the DSI well in harms reach of the fork arms, I need to go shorter if at all possible. If I move the guide scope forward I have to add wieght to compensate, or shift existing wieght, just to put it back again when Im done, yes higher power is what Im after...maybe a 3X
