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ettlz · (This post was last modified: 10-09-2021 01:30 PM by ettlz.)

I just got a 20S with reflector burn (made in Brazil -- a good deal at the price I paid, given how rare the HP 2xSs seem to be in the UK). My experience was:

Using a 3.2mm drill to cut out the four heat-stakes under the battery cover left me sufficient material on the back cover to install small self-tapping screws on reassembly, as the friction pins in the corners are terrible for breaking off.
The display's reflective layer, which is the outer rear layer with the white backing, was attached with what appears to be clear acetoxy silicone -- i.e., bathroom sealant. It stank of vinegar. It took a good bit of isopropanol, cotton buds, isopropanol-impregnated wipes and elbow grease to get rid of all the residue. But this is a different 7-segment LCD so may have different layers to the 7x5 matrix display in the 22S.
Working with aluminium foil (even the thick variety) to fashion a substitute reflector was a pain and I gave up on this. I wasn't able to come up with a method that both kept the foil even and would prevent possible shorts.
In the end I cut out a piece of white card and put that in place with no adhesive. The result is a slightly darker display, but it is still quite legible. Later on I might try with some silvered craft card.