First I took off the plastic tap. I thought about keeping it but its a 'push and hold' job and I didnt fancy draining the whole tun with my thumb jammed up against the tap. Then I cut a washer from a silicon muffin dish (2 in the end)
and screwed the brass tank connector into the hole.
Then attached a tap and spout from a previous build
As a false bottom I finally found a cheap colander and snapped off the handles and stand,
then fitted a length of tube around the rim to try and get a snug fit in the mash tun, not quite tight enough I fear, small gap visible at about 10 o'clock!
After a test run with hot water I decided to foam-fill the lid as heat was escaping through it quite quickly (7c/hr). I used a bit much and now the lid has a noticeable bulge that wasn't there before
Measured temp drop now 5c/hr using only hot water. Previous experience suggests this'll drop to about 1-2c/hr when its wet grain in the tun. Some of the initial loss will be down to heating up the tun too. No discernable warmth on the outside even with 75c water inside. Finished tun waiting for its first run.
I hope this encourages others to have a go.
