Pivot device to step mast through cabin top

[triathjohn]

Hi Greenlake,
a couple of years ago you posted about a homemade device that allows mast to be walked up then slid down through cabin roof to keelson. Could you please repost or resend it to me?
Thank you for all your great work on this forum.

[GreenLake]

I think it's mentioned in this thread MAst Stepping an old DS1. There's a link there t the description.

And i you look in my gallery there are photos.