Can you use this magnet to guide a metal plumbob inside a wall to a predrilled hole for fishing electrical wire from basement to attic?

If any metal in the wall it will stick to it. This is a very strong magnet and you may lose it in the wall if you use a cheap string...

Are you supposed to add thread locker?

If on fishing line you should not need to. I don't know why you would need to remove the ring from the magnet housing, but you could add some thread-lock.

ASIN	B0BDFJWGWY
Best Sellers Rank	342,697 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 1,982 in Rare Earth Magnets
Brand	DIYMAG
Colour	Silver
Customer Reviews	4.4 out of 5 stars 1,988 Reviews
Included Components	no
Item Dimensions L x W x Thickness	50L x 50W x 52Th millimetres
Item Shape	Round
Item Weight	0.18 Kilograms
Manufacturer	DIYMAG
Material	Neodymium
Material Type	Neodymium
Number of Pieces	1
Number of pieces	1
Product dimensions	50L x 50W x 52Th millimetres
Pull Force	300 Pounds
Shape	Round
Unit Count	1.0 Count

DIYMAG Strong Neodymium Fishing Magnets, 300 lbs(136 KG) Pulling Rare Earth Magnet High Power with Handle Diameter 1.97 inch(50mm) for Retrieving in River and Magnetic Fishing

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