I am making a tool rest for my bench grinder, following Chapter 3 of Ian Kirby’s book. There are a couple of points that I’m not clear about. The first is about attaching the grinder to a plywood base.

“Once you’ve located [the location of the mounting holes], drill and counter-bore the plywood for 3/8-inch hex-head machine bolts.” Lower down on the page is a list of parts that says “Motor–held to base with 2-1/4 x 3/8 flat-head machine screws.”

I don’t understand those two sentences, which seem contradictory. When he says “motor,” does he mean the entire grinder, and how is it secured to the base?

The next page refers to the wooden posts that support the tool rest:

“…steel screws driven through the base and into each post will make an adequate attachment;…While it’s not vital, there’s no harm in adding a glue block.”

What is a glue block? It’s not shown in the illustration.

Thanks,
Janet