looks like a sanding disc with some heavier foam on it. It wont automatically center up your bowl either. I use a home made vacumm chuck cylinder ( 4"pvc with split nylon tubing around the top edge mounted to a groove on plywood mounted to faceplate). With tailstock brought up it works great....then turn on the vacumm pump and finish off the bottom.............if it seals good......if not I finish the lil nub off by hand

Curt, you can make one quite easily: Get a cheap, 2"-3" face plate, cut a sacrificial block the same dia. & mount it to the face plate, cut some carpet pad alittle bigger than the block & glue it on, then cover that w/a piece of old chamois & staple the chamois to the block. Mine has worked well for over two years.

Another of Mother Necessity's inventions.

Keith, I became tired of trying to hold the bowl & the foam and tryin' to line up the tail stock.

That's what I like about WR. Quick answers!

Thanks for the heads up and the great suggestions.

Hey Phil, if you find out where to get neoprene let me know.

I thought I invented this gizmo.  i did this once with a small jar and an old sanding pad.  It workd great for a 3" piece.  Then when I tried a 6" version I really screwed the pooch.  It think it's still hanging on the wall, but only because I haven't cleaned out that section of the shop this year.  I do a sacrificial circle out of MDF, super glued to another MDF circle on a faceplate I keep just for returning.  I glue it up, clamp for a minute and then turn to the right diameter and angle.  I then cover it with a closed cell product sold at Home Depot to put over those wire shelves everybody is puttin in closets.  It's sort of like drawer liner, but very heavy.  It doesn't shift like the draw liner stuff.
If you haven't tried this next technique, do so.  One-Way makes an adapter for their revolving center which makes it easy to mount your chuck or faceplate on your tailstock. You take your piece, still on the faceplate or chuck and mount it on your tailstock.  You then make up your "deadman" or returning piece and bring the two together.  You get to check the fit and you are absolutely sure it's aligned.  You can start your backside work and then remove the chuck or faceplate and finish off the bottom.  Works like a charm.

Yeah, I'm going to stick with the 5 jam chucks I have used for years, thought I could finally use them to make bowls and such...oh well, thankfully it was on sale.  Sometimes the free stuff is better than bought.