Sliding glass door latch

Your original handle is unfortunately just a little too old. The only thing that we can recommend is an all new replacement handle set, like our 82-030. This should be compatible with your old mortise but it would require drilling new holes to install. Look it over and see what you think.

Hole center dimensions for 82-030

Dimensions for 82-030

Hey, Tom. To be clear, there is a good chance that you will have to send our handle back regardless of how it works. I have to stress that your original door is very old and I don't think anything like your original set has been made in a long time. The 82-030 is my best guess, but it is by no means a guarantee.

Looking at the first picture I send you, the handle on the right is the interior pull and the handle on the left (with its backside facing the camera) is the exterior pull. That's really all there is to it. 

I'm not sure what other photos we can send you that would help, since these have such a simple function. They just screw to the door on either side while the thumb lever engages the mortise. There isn't anything else to it.

I know for sure that that last part will work; your mortise appears to be a match for our 82-218, which is fully compatible with the 82-030 handle set. However it's the "screwing to the door" part that I'm not sure about. Like I mentioned before, you very well may have to drill new holes in the door to get this to work, assuming you don't have the same 3-15/16" hole spacing, and even that isn't a guarantee.

At the end of the day, you will have to make the final judgement. Trying to repair older doors like yours is unfortunately always going to be a gamble.