This is what I’m using to move the laser along the Y axis.
They consist of a two 608Z skateboard bearings(ID: 5/16″ OD: 7/8″) from vxb.com via Amazon.com, and three steel washers (ID: 5/16″ OD:3/4″) on a bolt(2 1/2″ X 1/4″). There will be two on each side to help keep everything from toppling over. There is also a quarter-inch nut on all of them. Between the nut and one of the washers there will be a piece of wood or aluminum, attached to which will be the X axis parts and the linear actuator on the bottom.