Here are pictures of the door lock assembly for a 41-48 front door. I assume it is similar to the 38 and do agree that the failure of the brass cam is what normally causes handles to sag. The only other problem could be that the spring holding the cam tight is broken so is unable to support the weight of the handle. It is typical that the driver's side handle is the first to sag because of its usage and one also should be aware that the locking mechanisms are not interchangeable. They are side specific and any opportunity to buy a driver side mechanism should be taken advantage of.
The problem with the cam is it becomes worn and loose in the area it is mounted onto the frame of the lock mechanism. If you could tighten it up by compressing the brass where it is mounted to the lock frame you could correct the problem. The problem is that the brass easily cracks when you do this and doesn't bend to make a tighter fit perhaps using some heat would help?
![[Linked Image from i1321.photobucket.com]](http://i1321.photobucket.com/albums/u560/41chevymike/IMG_3415_zpsqld3zpkd.jpg)
The next picture shows the cam with the
tapered screw that holds the handle in place. The screw can actually be tightened to adjust the sag in a handle if the cam is in good condition.
![[Linked Image from i1321.photobucket.com]](http://i1321.photobucket.com/albums/u560/41chevymike/IMG_3417_zpsrxlk3xqx.jpg)
The next picture shows the back side of the locking mechanism where the cam is mounted.
![[Linked Image from i1321.photobucket.com]](http://i1321.photobucket.com/albums/u560/41chevymike/IMG_3418_zpse8giujcn.jpg)
The next picture shows the brass cam compressed against the frame of the lock mechanism
![[Linked Image from i1321.photobucket.com]](http://i1321.photobucket.com/albums/u560/41chevymike/IMG_3419_zps30wolhfg.jpg)
This picture shows the typical damage incurred when someone has tried to compress the cam (two cracks). When I tried to repair a loose cam I used a socket and a bench vise. I did not hit it with a hammer. Maybe preheating the part would have helped?
![[Linked Image from i1321.photobucket.com]](http://i1321.photobucket.com/albums/u560/41chevymike/IMG_3421_zpswou0s3i6.jpg)
The last two pictures show the screw installed holding the door handle. Notice that the frame of the lock mechanism is designed to cover the head of the screw so it can not
fall out.
![[Linked Image from i1321.photobucket.com]](http://i1321.photobucket.com/albums/u560/41chevymike/IMG_3423_zpsqrif8fzr.jpg)
![[Linked Image from i1321.photobucket.com]](http://i1321.photobucket.com/albums/u560/41chevymike/IMG_3424_zpsoey993wu.jpg)
Thanks, Mike
P.S. Lets continue this discussion by others sharing their comments so we can better understand this common problem. There is a good possibility that I can not see "the forest through the trees" so help me out here!