After seeing the new ZD's with their maintenance, I decided to see what I could do to make my ZD28 a little more accessible. I can get the platform off and on easy enough, after cutting a slot in it so I can slide it by the footbrake. But I'd like to take the plate off under the seat. Four easy to get at bolts, but how do I get the deck height adjustment knob off? Unsrew, pull off, or do I need to detach the shaft underneath? I tugged on it pretty hard, and tried unscrewing it with no luck. Thanks.