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Thanks for asking, but they are sold.

I took these off my 4150 Happijacs because I prefer the simple hand crank. They're in good working condition but I don't need them. Etrailer says they are compatible with all Happijac camper jacks - a snap to install. Note: I'm selling just the two motor heads with all parts needed for...

dodean, Thanks much. I charged ahead, fortified by all this good advice. I'm pleased to say I can now crank the roof up and down one-handed. A new crank handle (old one had mangled teeth) also helps -- it doesn't constantly pop out. Cheers

Callumayers, did you get your dimensions? I can measure my old Northstar for you, if that would help. But looking at your picture, my sliders look the same. That is, the sliders end up about 2 inches from the gear housing with the roof fully down. Question for you: your description of setting...

It's good to hear there are experts out there. I'm just starting the process of getting this Heco system to work properly. First off, I ordered a new crank (old one's gears stripped, which I figure is why it keeps popping out). Second, I want to adjust the torsion as described by Ghetto Johnny...