Thanks Andrew, good idea. I do have a windscreen wiper motor and speed controller, which I've intended for a couple years to make a motor drive. Maybe this summer.
Pekka, that sounds great. And proper! I just wanted to get it done today, and I had purchased some 2" x 3" x 3/16" wall rectangular tube the other day as bearers for the head re-surfacing.
There was no obvious way to hold down the head as it extended the full table width, AND up to the end of the T slots in length. I thought about welding up some brackets to extend over the casting ridges, then doubled back under. But that didn't appeal to me.....
So, uhhhhh, I just uhhhhh, super glued those bearers directly to the table using about 8 "dots" (spot welds) all around for each bearer. Let that cure for a half hour. Then I surfaced the tops of those bearers with the new fly cutter, which made them parallel with the table -- and proved out to my satisfaction that the rig would hold against the interrupted cut, etc. Especially with the much heavier cast iron head on top of the bearers. If things were going to break loose, it would happen at the bearer stage when there was little inertia and weight to prevent movement.
So then after surfacing those lightly, I just placed the head on top and glued that baby down! Here's what it looked like ready to start to cut: