See if this works with your machine
This set of heavy duty castors is for the Juki J-150 Table. They can be attached to the legs to make the table mobile and with locks, they allow you to lock them into a safe position to sew without worrying of pushing it out of place. M12-1.75 Thread, set of 4.
Part Number: PAU SM-AMS-230008
Guaranteed to fit.