You can just twist it upwards by hand until it sits level when you release it. I did it with mine over 30 years ago.
Do not try to bend the stem of the handle to correct the sag. Fix it the correct way and replace the spring. Springs are available and it's a fairly easy replacement.
The best way to fix the problem is remove the latch assembly and thoroughly clean it to remove all the grease and grime. Once clean, you can locate the offending broken spring. Mount the latch in a vise where you can have good access to make the repair. You will see that the spring is held in place by 2 short tabs that are bent at a 90 degree angle to the latch and pinched together to hold the spring. Use a propane torch with a narrow pinpoint flame and heat the 2 tabs until they are almost red. While still hot, you can then bend them SLIGHTLY; just enough to remove the spring without damaging the tabs. (Be careful with the tabs - you'll need to use them again). Install the new spring in the latch mechanism making sure it's nestled in the right spot and heat the 2 tabs again then take a pair of pliers and pinch them back together to firmly hold the spring in place. After things cool down, use your favorite spray lubricant on all the moving parts and you should be ready to reinstall. I would test it by inserting the handle and make sure it returns to suit you. You can do it!
Glad 'Old Henry' is still being cared for. Welcome back, Craig!
There's an original right/passenger side front door latch assembly for sale on eBay right now. See > https://www.ebay.com/itm/155257436873?hash=item2426107ac9:g:90kAAOSwVk1jcre-&amdata=enc%3AAQAHAAAAsAwFtBjGLmCMnqZ%2BtM0ycCgDwL6dvTI1xB%2F3pagC0pVSoj1vL8oNNdWetI2MZGkUouGzFg5I68NBCTm%2FUP4YboQIv67SZHc8S%2FnD3k%2Bo1%2F0cEWHT7cjnTd30yLfA5O5foXLNb4O8Sg2ycJnWVdZeVIY%2F389o11A6oorbVhQXweBofTB38QdGnaUhSRZkC5rmUCRDRxVRh6Jx0dkMzKXOfIJkTh0lZsdTzUos14Kc%2BTxg%7Ctkp%3ABk9SR-qrkMS9YQ
Graig , welcome back, we have missed you and your travels,
Lawrie
I just bought a new handle hoping the bad spring was within it but it is not. Is it inside the door?[/delete
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Yeah, I found a lot of every latch except the driver's door that I need. Darn.
Returned from 18 month mission to Hong Kong in February. Getting ready to go on another to parts unknown. Just got Old Henry out of the body shop where he'd been for 3 months for repair after hitting a deer on a lonely road in Wyoming on a road trip in October. Heading out for a multiday road trip through the Colorado Rockies next week. Glad I've got the newfangled fresh air heater to keep little Lady (15 year old Chihuahua) and me warm.