Chain Bender,
Yes 1/4" flat stock, yes sharpened leading edges that contact sod,down pressure exerted by me via the manual lift 3 point hitch on my Sears ST16, get video out as soon as i can. Think weight on it rather than may be a good idea! tried it today, failed miserably!it started out good got under the sod and cut, but then the tractor lost traction, when i raised 3 point to regain traction the cutter got on top and lost the cutting effect!
oH WELL back to the drawing board! your design looking good !!!