If you slot the holes slightly on the brackets its a piece of piss!
i just this moment accomplished this feat. I used mole grips and patience. it took 20mins ish. Longer screw just so i can catch the other end with a nut
I used a BZP M6 machine screw with a penny washer 50mm then once tightened i hacksawed of the remainder to about 30mm length.What size and thread pattern screw/bolt did you use so i can get some before i give it a blast