To further what Mike is saying is that the pin and stainless jnt. collar are 1 pc.
The pin is not separate.
I did a thread on this topic a couple of yrs. ago, complete with pics.
Do a 'search'. I'm sure you'll find it.
What this means is that you won't see the McD. QR pin without the SS collar.
However, this is one of the simplest pins to make.
I make a maintenance pin for the cue from a SS 3/8x16 bolt. I can make a complete
pin in similar fashion. If you have the pin, you can make the insert as well.