You mean you need something stronger then a coat hanger?
A piece of flat stock maybe 1/8th inch thick. as wide as you can keep it, you can drill a hole or two through it and drop a bolt into the holes that fit the hole size ontop of your carb. unless you have some way to punch out a piece of the flat stock and give it a 90 degree bend to fit into the given slots on top of your carb.