I puzzled over how to cut the mortise in the latest (and greatest?) main mast step. The step is too wide for my mortising machine and I wasn't looking forward to drilling and chiseling the mortise.
Then, in a brief exchange with my brother-in-law, I realized I could cut the step in half length-wise, use the dado blade to cut half the mortise in each half and glue it all back together.
And so, that's what I did. It worked quite well. The mortise fits the tenon on the mast and the foreward edge of the mast is positioned where it should be. Can't expect any more than that.
The step is white oak with maple spacers. The step measures: 65mm x 135mm x 300mm.