[link=http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXK260&P=ML]This[/link] one costs half what [link=http://aero-works.net/store/detail.aspx?ID=274]That[/link] one costs and is probably cost effective if not very robust. I have a home-made cut from a piece of paneling veneer with a half-circle cut-out ticked off by hand from a protractor and slotted into a block that I shim up or down from a table top with scrap wood and it works as well as any. I end up flying it and making adjustments to suit me rather than the high/low throws from the plans. C.G., weight and personal taste can alter the best throws.