68 parking brake cable mount - In cab

[Short68Chevy]

I need some help. I cant figure out what I am doing wrong. When I pull the parking brake handle on my 68 the cable and the sheathing move. There is a little bracket the attaches the cable to the column. I am not sure if it is the correct bracket. No matter how tight it is the sheathing pulls right out keeping the brake from engaging. Does anybody have a picture of what the bracket looks like. Mine looks like something you would buy to keep wires together. Any help would be appreciated.
Jeff