Hi Dave,

Please send me an email, so I can send you the pictures (I lost your email)

>I've always lubed my hinges (w/moly) to the point the doors now barely stay open >on a slope.

Maybe the shoulder rivets are badly worn so the rod isn't held by the cam and now riding on the cam bracket and rivet head.
That would explain why your door detent is lousy now. (look at my pictures)

>Once the roller cams get a bit worn on their studs and the U-spring metal >fatigues then problems are inevitable.

The 7MM rod doesn't fatigue, It gets cut after the shoulder rivet wears.

>I would think used is the best option, rather than repair.

If you get lucky. A set of four used 740 front hinges is in the mail
to me now. I'll tell you how good they are after I get them.

>Extra care needs to be taken to crack and restore the paint bond after >adjustment for rust reasons.

Please explain? You lost me here.

>Without checking, I'm only guessing that 240 hinges don't fit. Even if the >bolt holes align the pin also has to align.

You're probably right or Volvo wouldn't have a different part number for 700/900s. But the detent spring/7MM rod is replaceable.
Maybe that 240 spring will fit the 700/900?

Check for cam slop and see if the 7MM rod is being cut in your car.

Bill