Those are basically what I'm talking about, but I've only used the ones that Lou sells at
www.heatpressessentials.com and I bet they are cheaper than Stahls. The Interchangeable Platens for Stahls' Hotronix
® Clam Press listed below those are what I'm talking about when I mention the sleeve platen. They really make things easier for pressing around seems, zippers, or just minimizing the area exposed to heat. I don't have one for my Hotronix 16x20 clam, but I use the sleeve platen all the time on my Hix CHE-2400 for all kinds of things I never thought about when I got it. I'll likely get a smaller square one because I use the sleeve platen alot for bags and sometimes it would be nice to have the smaller square for cinch sacks and such.