I have a set of double doors that have these specialty concealed hinges. The issue is that the door they are mortised into is a veneered solid particle board. These have been installed 20+ years and have now done a number on coming loose, nothing for the screws to bite into. I want to "refurbish" the door so that I can get a few more years out of it. I plan on cleaning out the mortise and then putting in a solid block of wood that would be glued and screwed, then remortising the hinge back in. I don't want to purchase a new door, not an option at this point. Can anybody offer up any further ideas that might beef up the hinge area?
Longer screws to start. You can also glue a couple toothpicks into the existing holes until they bottom out, then snap them off and then put in the longer screws. There is also a wood hardener product you can apply but this isn't really its intended application and I've never tried it on loose fill particle board like door fill but it might work. I think you'll be all set with the toothpicks and longer screws though.
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I think you got the right idea. I would try to maintain the existing size/shape of the mortise and go an inch deeper, and put in a hardwood block shaped to fit. If you don't have a perfect Norm Abrams fit of your filler block, I would use epoxy to glue it in, it fills gaps better.
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