Shopsmith 500-520 Table System UpgradeMark V Model 500 to Model 520 ProFence table system upgrade provides a significantly larger worktable support system for older Model 500 machines including a 49% larger, 17 1 2" x 22" worktable and increased ripping capacity from 48" to 98" Larger worktable features: miter gauge T slots for improved gauge stability; new table carriage with dual tilt locks and wider support tubes for added rigidity: plus two adjustable, interchangeable direct reading