I'd go to Kroger and buy one.
What about grabbing the face mask? I think I've seen that called on a runner one time, years ago. I think the borderline grabs are ignored as "stuff arming". Offensive linemen can't do it. Running backs can unless they grab and twist, I think.
Is there a hard and fast rule about being on the LOS? Three feet? The OLs often are V shaped. I see this called on punt teams fairly often (not being on the LOS).