For the pin, there is a through hole through the head of the bolt. One side has a recess milled into the bolt head for the head of the pin to reside in. The other side is just a hole. Insert the punch through the side without the recess and give it a few taps with a small hammer. Put a plastic bag over the bolt and stick the punch through the plastic bag and then into the hole. The bag will capture the spring and ejector pin if they fly out.
Also, when punching out the pin, I use a 2x4 and put the bolt on the 2x4 with the bolt head hanging off the end of it. This will give the pin clearance to come out. Otherwise, your pin may bottom out on the surface under the bolt and you could bend it. Ask me how I know!
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