I'm not 100% happy with my boltrope slugs and not really at a stage where I can change the rig to track and car. My problem is the nylon slugs seem to jam when raising and lowering the main.

I replaced them with longer style slugs when I first purchaced the yacht but still no avail. I see the picture below the slugs have a wheel at the back of the slug , not sure on that purpose or if it would solve my problem.

I was thinking of wheels on the sides but so far are unable to track anything likewise. has anyone here got any recommendations to solve me problem?