[2020] Table Saw? How do you make centered half blocks for repairing Stone fences and such

The tablesaw is cosmetic only now, it isnt used for any crafting. Players cannot currently craft centered half blocks in any way; And I don't believe we've been able to for quite awhile even when we could craft at the tablesaw.

Your best option is to just use the creative menu and trade an equal number of blocks of the material of your choice for centered half blocks to build with.