Next was to make the middle section and roller. This is again a piece of box section but with 4 lengths of 80 by 6mm thick bar front and back.
Used some cardboard off a cornflake box to give me a little bit of play so the unit will slide up and down, 3 bits in there so probably around 15 thou padding put in when compressed!
There are 16 x M8 countersunk screws with Ny-locks keeping it in place front and back.
I also had to figure a way of locking the middle roller to the bar, this could well end up with holes drilled and grub screws and I have no easy way to make a key-way.
In the end I went back to the engineering shop I picked up the steel from and had a key-way cut in the roller using their broaching set. small cost but worth it. I milled a key-way slot in the shaft.

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