Poor Man's Spool Holder

Changeable width, poor man's spool holder.
I didn't have enough bearings hanging around the house so I invented this cheap version of a bearing. You will have to have 1/4"OD tubing. Mine is airline tubing, but you may have some left over from installing a water filter or you can get it from auto parts store or hardware store for like $0.39USD per foot. You'll need less than 4".
Need:
4, #8 screws about 20mm long
4, #8 nuts
4 pieces of 1/4" tubing cut to about 12mm or less. Cut to fit aft