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Here's what I did to make a workable latch. I removed and tossed the plastic handle/latch in the trash. I had some 3/4 x 3/4 x .050" aluminum angle, and cut two parts about 2" long. I trimmed one of the legs on each to maybe 3/16", and then bent it beyond the 90 degrees it was. Perhaps something like 70-80 degrees. I mounted one on the fixed frame, and the other on the sliding door (not sure what to call that thingy that rolls up...). Finally, I added a cup style drawer pull. It seems to be robust (haven't shower tested it yet...).
Here's the non-undercut existing handle/catch:
And here is the aluminum extrusion onto which it is supposed to catch, but doesn't. While there is a slight undercut on the aluminum extrusion, the catch is at 90 degrees, providing utterly no chance of working.
Here is the new catch with the undercut. I'd guess it is closer to the 80 degree angle.
And on the movable part an identical undercut latch, also showing the cup style drawer pull.
Here's the non-undercut existing handle/catch:
And here is the aluminum extrusion onto which it is supposed to catch, but doesn't. While there is a slight undercut on the aluminum extrusion, the catch is at 90 degrees, providing utterly no chance of working.
Here is the new catch with the undercut. I'd guess it is closer to the 80 degree angle.
And on the movable part an identical undercut latch, also showing the cup style drawer pull.