Haven't a clue about the Heisler, though I agree it'd be nice to see it in production again, with upgraded trucks (not that there was anything wrong with the old ones, but hey--the ball bearings and metal gears are nice!)
But in terms of your Climax issues, here's a web site that may be of assistance.
http://www.girr.org/girr/tips/tips5/climax_tips.html#pickupLater,
K