The OD on my SM headcap is just a bit smaller than a quarter. Between 1-1.5mm smaller than a quarter's OD. You'd be safe just using a quarter to find something to hold it in. Im assuming you haven't received yours yet?
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.