Putting side trim on 72 how in the heck do you get to the nut behind door hinge?

[72farmer]

I have finally started putting my freshly painted 72 Chevy back together.I got brand new upper and lower mouldings.How in the world do you get to the back nut on the upper mouldings on fenders behind top door hinge?I was able to get my 1/4" air ratchet in there with a 3/8" socket with nut taped in socket but it liked just a little more to the stud and i can't find the right length extension.I am at a loss.Anybody got any pointers???