Couple of points: First, Attach some sort of suction to the ends of the split fence. Take advantage of the opportunity to extract sawdust from right near the bit. Second, cut two, 4-inch slots in the L bracket one near the bit, the other near the end, on each side of the bit, and line up the split pieces. Then drill holes for bolts to go through the back of the split pieces, through the slots for adjusting width.
The one thing you don't have is some escape for trapped sawdust. Normally you would trim a corner off the bottom of the fence in wood. So you might use a straight piece of 1/8th aluminum below the fence trimmed slightly less than the width of the square pieces.
To remove sawdust from behind the fence, you will still need to cut an opening in the L bracket large enough for the larger bits to fit in and high enough for most bits to fit through. This might require that you reinforce the inside edges of the L bracket so it stays rigid.
None of this is hard to do, but helps explain why most shop made fances are made of wood.
The more I do, the less I accomplish.
Last edited by DesertRatTom; 05-09-2020 at 03:19 PM.