Why you should buy a clapper - improve your sewing!
If you work with knits or polyesters, a clapper will help get flat, crisp seams! My clapper in this video may look a little weird, it's technically a tailors board so the shape is different, but it can be used in the same way as a clapper. Here's a link to Wawak! https://www.wawak.com/pressing-spotting/pressing-accessories/wawak-tailor-clapper-red-oak/#sku=bo109