I have couple broken training bench circuit breakers. The broken part is the manual switch.

broken switch

I uninstalled one and tried to open it. I was able to open the back side which contains metal connectors and springs.


Hi, I tried to pull the livers from the two sides but it's rock solid.

Here's a photo of the 2 notches for the knob, but also aligning the knob with the notches didn't help to remove the knob. I might break it eventually but I would like to try possible solutions.

knob notches

Here're the sides livers:

left side

This is the back:

the back

First back disassemble:

enter image description here

Taking out the parts to check if there are screws for the front side:

internal parts

So the back only opens to the metal parts. I can't get to the knob !


I removed the knob, the spring might be broken. But I can't open the spring area:

aligned notches

I was able to removed the knob. But I can't get into the spring area.

knob is removed


I opened the front cover, now it's about finding the broken part.

But I think I have to open a working one to know where is the issue.

open front cover

  • \$\begingroup\$ IS it the plastic that stripped? Can it be pulled off and fixed with Polyurethane 3 day cure? Or 2 part cryanoacrylate \$\endgroup\$ Commented Aug 27, 2021 at 23:01
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    \$\begingroup\$ It should be a spring loaded switch like a circuit breaker except rotary so you shouldn't have to jam it to the end you just have to flip it till it toggles, I assume. The end stops should be rugged \$\endgroup\$ Commented Aug 28, 2021 at 0:50
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    \$\begingroup\$ There may be some kind of retainer be picked like a lock to pull off with 2 levers for even forces \$\endgroup\$ Commented Aug 28, 2021 at 16:06
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    \$\begingroup\$ I just noticed a hole in the knob. That's where it is fastened. Look down the hole for a screw head. \$\endgroup\$ Commented Aug 29, 2021 at 6:56
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    \$\begingroup\$ This question will likely be better off at diy.stackexchange.com \$\endgroup\$
    – Lundin
    Commented Sep 7, 2021 at 10:07

1 Answer 1


There most likely is no parts inside that are meant to be serviced by users.

For safety reasons, buy a new one.

  • \$\begingroup\$ I thought so. There are no screws for the front side. There are 4 screws at the back, which opens to springs and metal contacts. \$\endgroup\$
    – R1S8K
    Commented Aug 27, 2021 at 21:54

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