I purchased mine from TNT quilt boards...I believe they have two sizes. I purchased it it last year when doing BH Frolic and have it handy at my ironing station. Tntquiltboards.com

The Quilt Clapper
 

There have been times over the years when I have misplaced my clapper and used a clean piece of 2x4 wooden board. I usually use the board to hammer on those jeans buttons but it also works well on keeping seams flat.

I recently bought the Riley Blake clapper and it really does help. My seams/intersections really are flatter. I saw Kimberly Jolly use one - you may want to look over some of the videos from the Fat Quarter Shop for a demonstration. That is what sold me on the clapper.

I have an old tailor's clapper I got from Nancy's Notions many years ago, but this is a little different.

I have been using a hardback book, but it's becoming wearing to be grabbing it with thumb arthritis.

Is there a preferred weight or size that everyone likes?

I am thinking that if it had a handle, I could use my arm to lift it, and with a bit of weight, I could maybe avoid pressing down on it or at least less.

thanks,
charlotte