What do you call that hand tightened bolt device that fits in the mast lug track to block the lugs from coming out where the track widens? I will call it the lug stopper. Anyway, I sailed on a friend's J-35 and his boat has a stainless steel plate that screws to the mast at the wide part of the track where you can remove the lugs. The plate only covers the widened part and leaves the track to run continuously past. Does anyone know if this can be purchased for other boats like my Hunter 34?