I need advice on how to keep a 48" diameter "cat exercise wheel" axle made from 3/4" pvc pipe free floating on an [18" lag screw] (http://www.amazon.com/dp/B009ZZJCB4/ref=biss_dp_t_asn?&tag=rnwff-20) that I'll screw 3" into the stud in the wall, affixed so the 15" deep cat exercise wheel spins in place but doesn't move too much from side to side?
(picture a 20lb price is right wheel spinning on a bolt coming from the wall) The 18" lag screw is only partially threaded so i can't screw a bolt on each side of the wheel to keep it in place.
I went with an 18" lag screw to hold up the wheel & cat (~20lbs max) to minimize the footprint of the structure .
How do I address concerns about the daily movement on the bolt from use of the cat wheel to keep the bolt from coming out of the wall?
The design had to be sub-$50 and super easy as my cat may not even use this wheel so I can't do the more expensive designs that include plywood, etc. Thanks