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  • okiemutt commented on prank's instructable Make your own ferrofluid in 5 minutes3 months ago
    Make your own ferrofluid in 5 minutes

    For rare earth magnets cheap, hit up a two way radio shop. I'm constantly replacing speakers in portables (uh, walkie-talkies to those not in the industry). The, more or less, dime sized neo magnets are what I use to hold a lot of tools suspended from the four foot fluorescent light over my repair bench. Drivers, wrenches, a hammer... They're small but powerful.Many manufacturers glue speakers into plastic front case assemblies which, labor cost wise means saving the customer $$ by replacing the front case. So be prepared to rip a lot of speakers out. Most magnets are bonded to the spider (speaker frame) so you may have to cut and/or grind the spider away then peel, close to the magnet, with pliers to free the relatively brittle magnet. This is worst case. I've popped hundreds loose wit...see more »For rare earth magnets cheap, hit up a two way radio shop. I'm constantly replacing speakers in portables (uh, walkie-talkies to those not in the industry). The, more or less, dime sized neo magnets are what I use to hold a lot of tools suspended from the four foot fluorescent light over my repair bench. Drivers, wrenches, a hammer... They're small but powerful.Many manufacturers glue speakers into plastic front case assemblies which, labor cost wise means saving the customer $$ by replacing the front case. So be prepared to rip a lot of speakers out. Most magnets are bonded to the spider (speaker frame) so you may have to cut and/or grind the spider away then peel, close to the magnet, with pliers to free the relatively brittle magnet. This is worst case. I've popped hundreds loose with a screwdriver over the years. I keep a stack on my bench just to pull steel filings from grille cloth of radios.

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