Coupler Spring tool - need ideas

[TMo]

Used Wayne's suggestion with a coupler that I'd removed this morning.  The blade (I used a #11, #7 would have worked better) into the end of the spring certainly gives you a lot of control to guide the empty end over the plastic lug of the coupler.  I found that getting the spring on the coupler shank first allowed me to maneuver the blade and the knuckle at the same time to fit the spring on the knuckle end.  Thanks for the tip!