Lay one support on the table, with the grate mount slot touching the table.

Get the Shaker Mount and tighten 3/4" bolts with nuts to the Soil Shaker so the bolt head is where the hammer will be.

Prop this up on the hopper support, so the first bolt is about 2" above the 28" hole and both bolts are touching the support.

Mark which side of the shaker you are welding the bolts for.