Garage doors weigh from 80 to 200 lb (37 - 90 kg)[0], so you'd have to hang one of these from it[1]. Hmm, that doesn't sound too bad. Here's some smarter people

Garage doors weigh from 80 to 200 lb (37 - 90 kg)[0], so you'd have to hang one of these from it[1]. Hmm, that doesn't sound too bad. Here's some smarter people than me discussing it[2]. Also, here's a company that sells them[3]. Looks like they use a pully system to double the weight and half the distance. Neat! I feel like I may have seen one of these before... [0] https://veterangaragedoor.com/faq/how-much-do-garage-doors-weigh/ https://veterangaragedoor.com/faq/how-much-do-garage-doors-w... [1] https://upload.wikimedia.org/wikipedia/commons/1/15/Heavy_Dumbbells_200_pound.JPG https://upload.wikimedia.org/wikipedia/commons/1/15/Heavy_Du... [2] https://engineering.stackexchange.com/questions/8692/why-arent-counterweights-used-more-for-garage-doors https://engineering.stackexchange.com/questions/8692/why-are... [3] https://www.hermco.ca/products/2000-series/ https://www.hermco.ca/products/2000-series/