A Seldenremovable/retractable gennakerbowsprit, sold as a kit for adaption to your yacht. Basically, you fit two pad eyes on deck in line with the bow bracket. The bow bracket is a stainless ring with a polyamide (PA) inner lining through which you slide the bowsprit to active position. When you're done with the gennaker, slide the bowsprit back and secure it to the aft pad eye. The inboard end features a spring-loaded plunger for easy attachment to the pad eye.
The gennaker tackline is preferably pulled through the bowsprit. The line enters a well rounded hole in the outboard end and comes out through the inboard end. Alternatively, a tack block can be fitted to the outboard end.