Just a small teflon disc to drop into the mast hole, soft enough to help absorb any grit. Take it out regularly to clean off the grit. Helps to prevent wear to the boat.
 
TEFLON DISC PROPERTIES
Disc diameter
60MM
Suitable for classes
LASER
Thickness
1MM
 
Laser® is a registered trademark owned by Velum Limited and currently licensed for use in Europe to Laser Performance (Europe) Limited. Rooster Sailing Limited is fully independent of both Laser Performance (Europe) Limited and Velum Limited.