Uh, oh. I should have warned you about the hammer. You don't just need a new grommet, you need a new handle as well. Have a look at the bottom of your hammered handle, I'll bet you smashed the e-clip groove and mushroomed the bottom of the shaft. If you didn't, you're lucky! That's sure what happened when I took a hammer to one. I suppose some time with a dremel could fix it, but... Ponyboy has replacement grommets and handles. The handles are dirt cheap, and will really make your stick look like new when you walk up to the machine. I replaced my damaged handle, it was rusty and the ball was dinged up anyway.
BTW, I found his grommets to be a lot softer than the ones that were in all my Wico sticks, so you might want to replace your other grommets at the same time, so they all match. Or not, your call.