Well after the Cat 5 hurricane we replaced the carpets with new deep pile. And I am 6 ft tall 185# in good shape and I’ll be darned if I could get our Dyson Ball Animal 2 to move without it being a SERIOUS workout. Our house keeper just can not use it. Read all the posts there are several solutions. I did not want to permanently modify so I tried the wire tie suggestion by williams and Barry Armitage. Fist pic shows the wire tie on the back posts and on the bottom right you can see the red locking lever in the unlocked position. Just opposite on the left you can see the socket where the locking pin goes in. The next photo shows the pin partially inserted to where I met resistance. The next shows my forefinger and thumb squeezing together to seat the pin all the way. Very important because if you use the red lever to try and lock it you risk breaking the plastic piece.  It should be every easy to rotate the locking lever. Final photo show the pin all the way in and the lever rotated to the locked position....