I'm lazy. I use a little chunk of 2x4 that I can slide under on its side and stand up for the right height. I just eyeball a little space under the block when I'm checking the front to back measurement, and call it good. One cut on a little angle would take the guesswork out, I suppose. I used to use a tape measure but this is easier. I figure with the minor changes in the lawn from bumps and hills and possible tire pressure changes month to month it's good enough for me.
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169 with tiller, 50C mower deck, Earthcavator, 42" front blade, Brinly tt100 toolbar, and QA42A snowblower, and now an Original!
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