Wanted to turn my R3 into a half rack with weight storage on the back, but Rogue was quoting me over $600 with shipping for their weight storage pegs. deadwoodgregg gave me the idea of trying to make the pins myself, so I went out to the hardware store today and got what I needed to put together 8 pins.
Final cost at the end of the day was $60 and I have materials left over.
All I did was buy some 5/8" threaded rod, some nuts and washers, and a couple lengths of 1.25" PVC pipe.
I inserted the rod through the side holes in the rack, threw a washer on both sides, threw a few nuts down the length of the rod to distribute the load, then capped it with another nut and washer. It's not the prettiest solution, but it doesn't look bad and saved me $550, so I'm okay with it.
Here's a pin with 270 pounds loaded on it. Seemed pretty damn stable but I kept it to 180 or less on each pin just to be safe.
Here's the finished product. A pair of pins at chest height for easy access to some 45s, a smaller pin at the top for the change plates, a pin in the middle for 25/35 (never use the 35s really, so I didn't give them their own pin), and another pin on the bottom for the rest of the 45s.