@BigEasy
Not sure if that handle is plastic. You need a glue to specifically glue plastics only. One name is Plastic Welder. Not sure if that is a Devcon product or not but when looking at glues, look to see if formulated for plastic only. glueing plastics .
Thanks to all of you for your recommendations. Was able to get second hand information that Lewmar used Plexus MA310 methyl methacrylate adhesive to bond the handle to the acrylic lens. (same stuff as Devcon welder product). Another recommendation is Araldite 2022 methacrylic adhesive. I am going to try the Plexus MA310 since that was the adhesive recommended by Lewmar. Heck, if it holds for another 10 years, I am good with that. I did receive a reply from Hatch Masters, they advised that they could make a replacement lens with a thru bolted latch/handle; however, I didn't give them the identification number of the lens, so they didn't quote a price.
If the adhesive option doesn't work adequately, I will likely try to retrofit the existing lens myself with a Lewmar thru bolted handle assembly. A new lens with handle installed by Hatch Masters would be my third choice.
Chief, I agree with you that a thru hole, backing plate, combined with adhesive would be the strongest assembly. I might try that option also. Somewhat concerned about drilling the hatch. My understanding is to start with a small pilot hole, then gradually increase the drill diameter, and to drill from both sides of the lens to prevent cracking the lens.
As I mentioned, I have four of these Lewmar hatches on the boat, I wouldn't be surprised if the others don't debond in the
near future.