Another open-reel tape query for the experts. I recall that new tapes would often come with a strip of (usually blue) silicone-ish tape to retain the end of the tape. I've got a couple of strips here and I'll swear that I've seen the stuff in other applications, but memory fails me.
It's not sticky in itself, but sticks quite nicely to mylar tape. Easily removed and indefinitely reusable. I think I've seen it in kids' toys of the era, where various patterned pieces were cut from the stuff and assembled on something akin to a whiteboard. Does this ring any bells with anyone? Do you know what the stuff is and where I can get some? Thanks for any help, Chuck