needle wheel for a mag?

[RockStarFish]

Is there a needle wheel impeller that will fit in a mag 3? I have tried a few DIY mods but none of them have worked. I am thinking of just buying a sedra but wanted to see if there was a cheaper way to use the mag.

 

[N-A-S-O]

check this mod out, it works on a kind of pumps:
http://reefcentral.com/forums/showthread.php?s=&threadid=966407&perpage=25&pagenumber=1