There are several different kinds . I like the ones the are sort of a little fuzzy on the outside but don't push them in and out too many times as it will lift the fuzz . there are some others that are sort of smooth on the outside . I find they don't stick as well for me . The ones you cut out yourself out of the bulk hinge material work fine but you need to make sure to drill the hole in the center of your hinge spot to allow the CA to penetrate ..You can shape them as you wish . Get every thing ready like paper towels and maybe some alcohol ,masking tape ,