You are 100% correct.Jody,Seems we are getting more RF complaints with 2.4 then we had on 72 and this should not be. Most of the time the plug cap is not pushed all the way on or is the incorrect cap for the spark plug being used. As you say the snap ring should be over the hex on the spark plug and it is a PITA to get on and off when new.Some times we relax the pressure on the wire ring a little to help to get the cap off. You do not need to use vise grips pry bars or Dynamite to get the cap off. Sounds like this is cap for a BPMR6A plug 3/4 hex ,trying to fit on a F 5/8 hex spark plug. The RCEXL 3/4 hex cap does not fit the Champion RCJ7Y well at all but that is another story. It fits the NGK and Bosch OK.When I install the A caps I use the boot for the F plug .This gives you a little more room for the spark plug. I have all of the cap kits if you don't.I have seen several of the RCEXL ignitions that have
had the braid broken all the way around where it exits the eyelet on the ignition case,this is easy to repair. Have all so seen them lose ground inside the case ,this is almost unfixable.
BCCHI