By shaft do you mean with 2 knobs? if so, McIntosh makes some...they control CD changers too
http://www.mcintoshlabs.com/mcprod/shopdisplayproducts.asp?id=33&cat=Control+Centers+%26+CD+Changers&prodid=1077&product=MX406
http://www.mcintoshlabs.com/mcprod/shopdisplayproducts.asp?id=33&cat=Control+Centers+%26+CD+Changers&prodid=1077&product=MX406