NEED SOME HIGH POWERED MAGNETS

[coastie65]

Thought about building the actuators for Liberty Prime. It was said they could be found in medical Centers. I know they singled out Milton General Hospital and Mass Bay Medical Center. There isn't one in Milton General Hospital and I have spent over an hour searching that place. I did find a safe that I had missed though. I think I have actually seen them in a Vendor's inventory for sale, but not sure. Will keep and eye open just in case and may actively run around and check at places such as Diamond City. The last time I played this, at this point I had already shot up the Institute and Railroad. I have already concluded the Nuka World DLC and the one with the Androids that opened another Vault type thing. Far Harbor is waiting, but haven't gone over there as yet. Will check out some more medical centers as there are plenty of them. I don't remember where I got the last time, but had Liberty ready to go. While in Far Harbor.

[SuperSledgeNY]

Here's a pretty good list of where you can get them, in case you haven't looked it up yourself

Locations

Two can be found inside the MRI machine on the ninth floor of the Mass Bay Medical Center.
Two can be found on a shelf inside the warehouse at Boston Airport.
Milton General Hospital, after the third elevator, in a box on the corner.
Medford Memorial Hospital, in a room behind the operating theater (3rd floor).
One is in the cellar of the Electrical Hobbyist's Club.
Occasionally sold by Percy at Diamond City Surplus.
Occasionally sold by Myrna at Diamond City Surplus.
Occasionally sold by Rowdy at the Atom Cats garage.
Occasionally sold by Alexis Combes at Vault 81.
Occasionally sold by Deb at Bunker Hill.
Occasionally sold by Trashcan Carla.
Occasionally sold by Trudy at Drumlin Diner.
Sometimes found at the Institute's science lab.
May spawn in the trash bin outside the RobCo Sales & Service Center, north of Boston Airport.

https://fallout.fandom.com/wiki/High-powered_magnet_(Fallout_4)

[waste of life]

4 of them are in the Mechanists Lair final dungeon if you have the Automotron DLC

[The Inept European]

It's one of the items that are a good idea to buy or pick up, and set them aside for later, when you see them earlier in the game.