sd formula
Active member
After reading a few threads on jackshaft openers, it seams that alot of you guys love the Chamberlain Liftmaster 3800. So, I'm considering the purchase of one for my single 9 foot wide overhead garage door. The problem is that I have raised the rails from the standard height (to accomodate a hoist) to approximately 11 feet, and the door is no longer balanced. I will probably have to change the existing spring or add a second spring & possibly change the drums. My question is which online garage door parts supplier would you recommend based on service, quality, price etc? I need someone who can analyze the situation & recommend the right parts to fix the problem. I see alot of 3800's for sale on line & on ebay, any suggestions??

