My arrow pistol had a similar bushing on it, although a bit longer. Here is a picture of the valve with the bushing installed. I sold it awhile back to somebody, but I don't remember who. Some guy with a dragonslayer and a bunch of DAQ's. Anyway if you want one, let me know if you are interested. I can get you one made in short order. Not sure of the price yet, but I have to get materials first before I do that.