Nice video/demonstration, Max.
I read about that method of tuning pin tightening in the Reblitz Book. I will admit that I have never used that method, but I have treated an entire piano pin-block with the CA glue (super glue) treatment on an old upright I had. That worked well also, and it treated all the pins.
I suppose the card-board method works well if there are only just a few loose tuning pins.
I read about a methods of pin Reblitz tightening in the book also. There are many treatments for a pin . However, with 89 - 91 pages I have not found a word about the cardboard
. My method "foot wrap" differs fundamentally from fact that does other technicians. I did not clog a pin. In my "foot wrap" a pin is screwing . What we gain in doing so.
First result screwing a pin is destroyed a shim by micro fibers that fill microcracks a pinblock.
Secondly "hot pin " smoothes around a hole these cellulose like an iron
Thirdly, it is a significant build-up layer holes in the bush and a pinblock . As a consequence of the decrease hole and additional friction .
Fourth, we do not hammer a pin. It is undesirable power load , which inevitably destroys the strength properties of the pinblock. I know that as a result of clog treat one sector boards and maim neighboring pins .
" That the method works well or paperboard only when only a few loose pins settings "- YES, but if many pins it is working also . If the pinblock has no significant massive destruction only