Same question, different approach-pictorial

[rockfla]

Okay
back to the 39 Mercury choke knob replacement. Offered "today" by Carpenters for a replacement is a choke knob with a "blade" style actuating rod. I have a "replacement" knob but has NO rod attached, just a slot cut to go over the "existing" rod which is "hex". ANY suggestions or successful attachment with the latter description. Again hopefully the attached pictures "explains it all"???