Rail coping sledge

It’s a well known Project of – so called – rail coping sledge jig. See video to know haw it’s used. It’s based on Rockler jig.
I used the clamp pressure buyed here https://www.uni-max.com.pl/produkty-pl/obrobka-drewna/sciski-i-stoly-stolarskie/dociski/docisk-gh-225-d
The next buyed element is a jig from Axminster https://www.axminster.co.uk/axminster-148-piece-jig-making-set-950114 , but you csn change it for M6 screw, but it’s neccesaryy to grind it.
Another elements of the Project are:
Six m5 screws + six nuts
One m8 & nut