I guess that's just the thing abaout canister filters. I had an Eheim ecco before and it was horrible to close, too. I finally broke something and had to get a new part, but then I had it figured out 8) .
Previously: 2x 10gal tank, 45gal aquascaped, 70gal aquascaped
Currently: 16gal FW, 40W CF, ADA Aquasoil Amazonia II/Tahitan Moon Sand, PH 6.5, kH2, gH 4