Anchoring a concrete screw - GIF

Anchoring a concrete screw.

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Previously:

Concealed wood screw technique - GIF
How screws are made - video
Repairing worn doorknob screw holes - GIF
Stripped screw head extraction trick - GIF

Why install the shelf bracket upside down?

What is he putting in the hole and heating up? That’s not candle wax. Is it plastic rod or hollow plastic tubing?

Quote:

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Originally Posted by mdhatter3

What is he putting in the hole and heating up? That’s not candle wax. Is it plastic rod or hollow plastic tubing?

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It was a glue stick and it doesn't do any good to shove 4 inches into a 1" thick hyalite block Besides he pushed all of the heated part way past the inside wall of the block.