[piper6909]

I wonder why they didn't use a regular internal c-clip that you can install and remove with snap ring pliers. That will be a justifiable cause for some serious curse words if you have to remove it. I can't remember the last time I've seen one of those, but I think I know the trick. You probably do too, but it wouldn't hurt to reiterate it.

Do you see how the clip has a slit at the 8:30 or 9:00 position in the picture? That is not a straight cut for a reason. If you pry it apart there, you'll see that one end comes to a point on the outside and the opposite end has a point on the inside. I think your best chance is to insert the end with the outside point first. It has the best chance of staying in the groove while you go around the horn pushing the rest of the clip in. Good luck!