(Topic ID: 5522)

How to take magnet core out for replacement

By The_Dude_Abides

12 years ago


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#79 3 years ago
Quoted from Mrg50:

I too had a mushroomed magnet core on my Spiderman and didn’t want to pull the core down through the playfield. I couldn’t keep the core from turning with a large screwdriver and didn’t want to damage the playfield. Problem was solved by drilling a hole through another nut and feeding a #6 nail through the nut and slot in the bottom of the core. See picture. This allowed me to use a large wrench to keep the core from turning while I loosened the original nut on the magnet core. Hope this helps some with a similar issue.
[quoted image]

Very creative!

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4 months later
#80 3 years ago

Just had my own need to swap the magnet post out of RBION and used a variation of the Harbor Freight prybar approach. I purchased their $4 prybar, and then used a bench grinder to grind down the fork to fit perfectly in the post slot. Took me less than 5 minutes with a bench grinder (and it helped that I had a fresh post in hand to keep checking the fit of the prybar into the post slot). I ground the prybar so that there was NO play at all when inserted in the post slot.

Then it was a simple matter of using a butane gooseneck candle lighter which makes a sharp pinpointable flame, and heating the nut, post and bracket just enough to be HOT, but not melt the coil spool. Once hot, I used the prybar for a few seconds and with constant pressure, it started moving just as expected(hoped). I kept going clockwise to unscrew the post from the TOP.

I decided to install the new post since I had it in hand, but I also went back to the bench grinder with the OLD post and re-ground the top and mushroomed surfaces for use next time I need a post swap. Again, 5 minutes at the grinder.

1 year later
#82 1 year ago
Quoted from Kennebunk:

RBION
Fortunately for me the nut came loose fairly easy with this 18" adjustable wrench. It started turning the core so I found something, the wire cutters pictured, that fit perfectly in the slot. Using vice grips to help with the torque, I was able to get the nut off then clockwise turning to thread it through the top of playfield. As you can see, the core was heavily mushroomed.
[quoted image][quoted image][quoted image]

Looks like the playfield wood around the post didn’t get damaged too badly, so fixing the post is well timed.

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