It fits tight on the shaft. Install it on the shaft, install the shaft and move the clip up until it abolut 1/16- 1/8 from the block. The clip keeps the shaft from coming out when you remove your dizzy.
Ok, I just went out and messed with it and I think a couple of the teeth are bent and it's just not holding well. I know as soon as I put the engine in and have to pull the dist. at some point that shaft is going to drop. Where can I get a replacement clip?
You can get a hardened shaft from ARP for about $30 that comes with a new clip, great for peace of mind that if your oil pump goes, your ignition will shut off seeing that it will not twist.
Or if your in a hurry and on the cheap, i'm sure your local ace/lowes has it in the fasteners section.