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Advice, tips or tricks for fixing speaker corners and veneer replacement - early 60s cabinets

I drill a hole and use toothpick or matchstick.
Also use smooth aluminum angle stock and an old credit card to shape new corner.
You can also add grain with a razer knife. Wax paper is your friend.
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Thanks lifer 70.

Well, I didn't follow my own plan and started mixing the bondo before adding the screws, nor did I prep the paper corners with wax.

I pulled the cardboard off after about 5-6 minutes and they came off clean as a whistle if I want to use them again. However, it's not looking bat at all...

Nice sharp corners! Couple of inconsequential voids, but should be a great platform to veneer over after sanding or using the chisel to get the right depth.
bondo corner.jpg

Hard as a rock after about 20 minutes and should be very solid under the veer.
 
This chisel seems to work really well. After cutting the straight lines with a utility knife against a metal ruler, using the wood under the veneer as a guide, I slid a 1" chisel across and getting the height was very easy.

The bondo curls up like wood chips, but much easier. I'm just going to use a bit of extra glue and sawdust in the void when laying the veneer.

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And the results. This one is much harder to spot than the others and I'm happy with the results for now.

A couple of small gouges and a bit more sanding of some glue on the side, but I'll fill those nicks with another batch of bondo and hit with some wood stain markers I got from home depot.

finished corner 2.jpg

Nice to have square tops on the speakers and no 'living edges'

Will try and live with it a few weeks and see if other folks notice or not. In any case, at the very least, I've got a good substrate on the tops to accept veneer, should I be tempted to shoot for perfection.
 
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