You need to go to the IH8MUD.COM forum and one of the folks there came up with a cure for the little white cap (that gets lost easily) otherwise you have to buy a new assembly ($$$) or you can strip the gears if the cap is missing. Give it a shot.
http://forum.ih8mud.com/sale-parts/202960-...tml#post2999788
-JJA
Albuquerque, NM B)