Vinyl sliding door latch replacement

A quick learner from Oregon says:
I am attempting to replace a broken sliding glass door latch. I discovered, after removing interior/exterior handles and some screws, the mechanism would not pull out and when I let go the latch plummeted down into the frame. It turns out that the screws to adjust the rollers are totally stripped, so removing the door could be a lot of work, I'd rather avoid that if possible.

I have learned that with many of these mortise latches, you have to remove the door to replace them anyway. I am trying to get a sense if this is common? It seems that on the top and bottom of the mechanism is a tab with a screw hole, I did not see those when initially trying to remove it, they must be somehow under the vinyl exterior?

Based on my brief struggle with the latch, I believe it to be generally similar to the 82-218.

The door frame seems to be vinyl with a metal structural 'frame' underneath. How the heck does one install a new latch if some part of this has to be dismantled?
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Dave Sr. from SWISCO responded:
Good Morning,

These are very good questions, hopefully I can help you out.

Through my experience I have found that you may be able to leave the existing mortise lock in the patio door. In most cases, the existing mortise lock should not interfere with the operation of the door.

The way I have, and still do, install the Swisco 82-218 Mortise Lock is to put the lock in the locking position with the locking hook exposed. Then, hold the hook with a pair of pliers, position it into the door, then open and install the mounting screws to hold the mortise lock in place.

I hope this helps. Let me know if you have any other questions.
A quick learner from Oregon says:
Thanks for the reply, Dave. You've put my mind at ease about the 'dropped' mortise lock. So far, the door seems to slide just fine, so I don't think it has harmed anything.

Do you have any suggestions on choosing the right replacement mortise lock? I didn't get much of a look at the original before it fell. I've photographed the lock hole and catch, if that could be at all informative?

Thanks again,
user submitted photo of mortise lock installation hole
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Dave Sr. from SWISCO responded:
Good Morning,

Thanks for uploading your images. As stated earlier, it does appear you may want to use the Swisco 82-218 Mortise Lock as a replacement.

Make sure you put it in the locking position with the hook exposed. This way you can hold the hook with your fingers or pliers, allowing you to hold it in place to install it into your door.
A quick learner says:
THe screws in the latch holes on my vinyl sliding door are stripped out. What would be a good fix?
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Dave Sr. from SWISCO responded:
If you're talking about the screws I think you are, then you should be okay. The screws install directly into the 82-218.
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