You "can", but that pin also keeps the crank from moving while you are monkeying with the pump. If you can find washers to fit in the hole you can use a piece of threaded rod with a couple nuts with several washers in between, may need to grind the diameter of the rod down. You can also find a bolt that threads into the hole and do the "pencil sharpener" with a grinder and grind a tapered point then screw that in hand tight. Just make sure you're on the compression stroke LOL.
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