The HW110LC/TC 2HP and 3HP saws feature a worm gear trunnion design whereas the HW110S 4HP saws feature a dovetail trunnion design that eliminates radial movement of the blade when making height adjustments because there is no hinging motion to the blade when adjusting the height as well as improving the lateral rigidity of the arbor assembly.
For a detailed comparison of the the Harvey Alpha Series table saws, check out our live stream where we discuss everything in detail at the support article link here: Tablesaw Talk - Tool Talk with Harvey!
Here is a diagram of the wormgear trunnion design:
Here is an image of the dovetail trunnion design on the HW110S models:
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