I picked up an older Scag SR-18B three wheeled rider for 400 bucks. Probably didn't need it but since it runs good I figured why not for the price, i guess it'll be a back up machine. Anyways, I'm not very familiar with Scag three wheeled riders because I've always ran turf tigers and was wondering how you adjust the cutting height on these. I want it at 3.25'' Then when you check the blade height do you measure from the blade to the ground? I've never had to do anything other than stick a pin the adjustment hole.