Great video, very clear instructions. Ive been using stainless steel threaded bar for this type of repaire for 12years with no issues less than £2:50 per meter over £50 for helical bar.
That's a good tip, helical bar is quite expensive, the cheapest I found was £8 a meter for helical bar so at £2,50 per meter threaded bar is a good alternative, but it should be stainless as zink plating can be eaten up by chemicals in the grouting and then it starts to rust.
So he slid that helibar in it looked like two or two and a half feet. How thick is the wall? I assume that there is another wall butting into this wall perpendicular, like a "T"? Or did he just run that thing 16 inched into the side of someone' desk inside?