All,
Thanks for the replies. Since I have some, I am going to go ahead and put a little of the blue Loctite on them as Transporter did.
I ended up making my own tightening tool out of a scrap piece of .063. I cut a notch about 2 1/8" wide and 3/4" deep. The "ears" slip into the notches of the ring and you can get it pretty tight.
I also used the "dreaded" fly cutter to make the holes. I am always amazed at how nice the holes come out when I use a fly cutter. It looks so violent and inprecise. But, after a little deburring, it comes out nice.