3ph speed on old B8200

[VashonFarmer]

So I understand that a lot of the Kubotas out there adjust the 3ph lowering speed with a knob under the seat. My manual says the same thing. However, no all of them have it. My early model B8200 is one of the few that do not have the knob.

So my question is this: Is there a way to control the speed on my machine? The manual does not suggest any other way. Second: the knob controls lowering speed. Is there a way to slow down the raising speed? Mine moves in both directions fairly briskly and I'd love to have a little more finesse.

Can that part be retrofitted?

Thanks