an "in line stripping flange" (or a mash injector) to convert any reflux still into a continuous still.. the only thing you need to do to the still itself is to add a drain hole to the bottom of the keg:
so you can add an overflow (the T piece is to stop the mash from syphoning out):
i got the idea from an in line beer carbonator in a commercial brewery (cant find the link)
the mash goes in the side (preheated if possible.. i plan to have a tub with a coil of copper that the hot slops run into from the over flow and the mash will be pumped through it before entering the injector) and is then pumped up the centre of the tower till it get to the end of the pipe and flows into the vapour stream....
i simply stick the copper pipe up the guts of some SS scours for packing..
i haven't welded the piece of pipe into the elbow because i will be testing different lengths of pipe to get the best result
the test run i did last night performed better than expected and that was without the mash prewarmer...