Santana, TD=17.7, length=21"

Santana 2023  sailboat mast with a milled feed slot cut down 6mm.
Nylon inserts pop into place.  The top 4" section is removable for adding or removing sail slugs.
The two longer sections should be glued in place for the best stability since they do not need to be removed.

You will need to drill a 3/16" hole for the insert's bottom nipple pin to drop into.
The nipple pin has a drill guide hole for a  1/16" drill bit in order for you to mark the drilling location behind the feed slot.  Remove the short insert to finish drilling with a 3/16" drill bit.

The textured surface or the nylon can be dyed a color.  Black is the best for UV protection, but any color dye or permanent marker can be used.

MastGates are custom-made for each boat because all feed slots are hand-cut and extrusions also vary over time.
Warranty replacement of individual pieces can be requested at a discount to original buyers for $49.95 each.
Info@MastGates.com
6/17/20 Build ref#:  "pg525A TD17.7mm 21 inch.V6"