The slot for the mast starts approximately 25in. above the boom. Lengthening the slot is absolutely required.

Important considerations of any improvement are durability and more importantly- thou shalt do no harm- if the extension causing snagging or other issues it's basically not worth doing. Additionally, easy removal (i.e. tool-less) while on the water would be beneficial, but possibly not necessary since there should still be room at the bottom to release a stopper and allow removal of slugs.

I have some aluminum channel from the garbage that I think might make for the perfect solution. Basic idea- two 20“ long pieces of similar thickness to current channel tongues bolted to four bent stainless steel sheet mount bent to match the angle of the built-in slot tongues, which are then mounted to the mast with either sheet metal screws, or some other quick release fastener. The slats should have counter-sunk stainless screws with heads flush with inside to reduce chance of snags.

Sail height is 7.5m (295 in.)

Recommended spacing is 26-30in. - which means 10-15 slugs total. At a height of 1/2in. per slug, stack height would still only be 7.5” with 15 slugs.

Cost: 24dkk for pack of two, cheaper online