Topper® Lower Mast base plug – to go in the bottom of the Topper Lower mast to protect the mast cup from damage by the mast. Please note that if this is the first time you are fitting this item you will need to use a circular saw to cut the mast If you are replacing a plug which has already been fitted, there is no need to make any further cuts off the mast. Fitting Instructions: 1. Using a circular saw to ensure that the cut is Straight. Cut 14mm odff the bottom of the lower mast. De burr the cut end. 2. Then using a 5mm drill bit- Drill 2 holes 8mm from the cut edge. Make your first hole on the back of the mast in line with rivet holding the lower strop. Then turn the mast through 180 degrees and make the second hole. 3. Gently tap in the blue mast plug all the way. Then using the drill holes made in point 2 as a guide. Drill into the bung 4. Using 2 rivets supplied (spares included in pack) rivet the base plug in place