I also came up with what I think is a nifty technique for aligning the rotary table.

I drilled the holes, one at each end of the slot, and one at the end (underneath the clamp on the left). I used an end mill and plunged the holes since I was going to mill the slot anyways. Bigger...

I needed to align the rotary table to the spindle, and I found this method is much quicker, and fairly accurate, although probably not quite as accurate as inidcating. I put the chuck adapter in the center of the rotary table and put a 3/8" end mill holder on the chuck adpater. I put another 3/8" end mill holder on the spindle, and put a 3/8" piece of brass in the bottom end mill holder. I had to sand the brass rod a bit in order to get it to just fit in the end mill holder. The hold downs for the rotary table were in place, but loose. I then moved the XY table to get the upper end mill lined up with the brass rod. Bigger...

I lowered the spindle onto the brass rod. This lines up the rotary table with the spindle. The rotary table hold downs can now be tightened, and the zero adjustable hand wheels zeroed. Bigger...

Now that the rotary table is lined up with the spindle, the workpiece needs to be lined up as well. I put a taper on the end of the brass rod and used that to center the hole in the workpiece with the spindle. There was a small hole in the scrap underneath to allow clearance for the brass piece. The work piece also needs to be well clamped. Bigger...

I put some layout blue on the brass, and moved the Y axis by half of the width of the brass piece. I lowered the brass pointed piece and rotated the table 180 degrees. The line left by the point will become the outline of end. The brass point is replaced by an end mill and the Y axis is offset by 1/2 the width of the end mill. Bigger...

This is one of the ends after cutting it. Bigger...

Here we can see the finished end next to the damaged one that came with the box. Bigger...

This is what the stay looks like when it's installed in the box. I created 4 washers as well, which can be seen in this picture. Bigger...