John
I am assuming you are asking about your SDM (#34 which is an 18" I believe?). I have found with my 20" on the ground board I made, which is very similar to an SDM one, at least dimension wise if not quality of workmanship!, that the turf has to be really thick for the it not sit down firmly. But if the ground is damp I like to sometimes sit it on a small tarp just to reduce any moisture getting onto the ground board.
Most days I never bother.
Malcolm
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