Sorry for the quality of the pictures (I am not a photographer!). The roller is .50" diameter and is .25" wide. I don't know the "axle"
diameter as it is staked and have to destroy it to dis-assemble.
I notice you have rollers with axles that are threaded. If something like that is available, I can drill the mount out to accept whatever the diameter of the thread is and install a nut.
Any suggestions are greatly appreciated.
Thank you,
Terry