The assembly atop the rudder post, to which the tiller is attached, is aluminum and it wears. Particularly if previous owners had been in the habit of standing up and operating the tiller w/o it being fully down, that assembly can develop play. It doesn't have to by much play for it to translate to the feeling that the end of the tiller is moving a lot, without "engaging" the rudder.
Somebody on the old P30 mailing list at SailNet had fabricated and milled replacement assemblies of bronze, IIRC. I wish I'd bought one when I had the chance.
We're going to have our rudder dropped either this fall or next spring for some glass work and re-coring in the aft 1/3rd of the cockpit sole. We'll look to having the rudder post bearings replaced at that time, and I'll ask a machinist friend how much he'd charge to fabricate bronze replacement for that assembly.
That slop doesn't seem to bother The Admiral much, but it drives me nuts.
Jim