I use a piece of 2 x 4
Catalina Direct shows a picture of a plastic piece that is manufactured to fit onto the curved top of a bow pulpit, with grooves, and a recess to lay the mast into. I took a piece of 2x4, laid it on the bow pulpit, drew lines where the wood made contact with the bow pulpit, and cut it to be just a wee bit longer. I cut another piece of 2x4 to screw onto the bottom, that would fit inside of the bow pulpit. I then cut two short pieces on an angle to make a cradle for the mast, and screwed them onto the top side. I drilled several 1/2" holes to allow me to securly pass a short line thru and tie the boards to the pulpit, and the mast to the boards. It gets stored in the garage after I've raised the mast.