I went ahead and drilled the new holes. I tried using the heavy duty rivet tool from harbor freight but it just couldn't grab the rivet with the spacers. It did grab one or two but that was about it. As that tool was only $20 I'm going to go ahead and grind the head down and see if that works.
Wish I had seen this thread:http://www.hobiecat.com/forums/viewtopic.php?f=24&t=40786&hilit=rivet+marson
before I started. I did buy a smaller hand rivet gun from Harbor but man that thing needs some muscle behind it. I installed a few of the rivets but they definitely are deformed and poking out into the track and the car is hitting them. Going to drill them out and start over. Need to order more rivets though.
Tim, does that Marson you have work well with a spacer in grabbing the rivet? I see in that other post that Murray's recommends the smaller rivet gun with a 3/32 stop sleeve as a spacer and that works well.
BTW, anybody order some longer rivets in bulk (3/16 x 5/8 at least CCC countersunk) that they would be willing to part with about 4 of them? I need a couple for the swivel head base. Those self tapping screws are worthless and I'd rather rivet the base on. the 3/16 x 3/8 are just too short for the job. Otherwise I have to order a $100 for $25.