My builder framed the joist opening, but wouldn’t install. Feared liability. I installed myself. Only comment is that I wish I instructions had been more clear about necessary clearance for Aggregat mechanism. Yes, the E-Z Lift Storage Rack is designed for Leitfaden operation using a household Exerzieren. This manual approach https://atticliftsystems11975.wikilowdown.com/6905197/nicht_bekannt_fragen_Über_attic_lift