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 Post subject: Stuck Piano Hinge
PostPosted: Jul Sat 17, 2021 12:51 am 
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Joined: Feb Tue 18, 2020 9:13 pm
Posts: 5
I have a Zenith 7000-2 that the rear cover hinge is frozen. I was able to open the cover enough to remove the screws that attach it to the case. I’ve tried wd40, Blaster, Machine oil. I’ve tried tapping it while drenched in each of these. I even tried punching the end of the wire of the hinge with a center punch, thinking it would break it loose. I’m having no success. Does anyone have a trick they’d like to share?

Rick


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 Post subject: Re: Stuck Piano Hinge
PostPosted: Jul Sat 17, 2021 6:43 am 
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Joined: Apr Sun 08, 2007 6:47 am
Posts: 4737
Location: British Columbia
Is it rusty in any way? Electrolytic rust removal might fix it, I have undone rusty threads by that method.
Regards
Arran


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 Post subject: Re: Stuck Piano Hinge
PostPosted: Jul Sun 18, 2021 1:40 am 
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Joined: Feb Tue 18, 2020 9:13 pm
Posts: 5
Arran wrote:
Is it rusty in any way? Electrolytic rust removal might fix it, I have undone rusty threads by that method.
Regards
Arran


The plating is peeling off, but there is no noticeable rust. I figure that the hinge is made of dissimilar metals that have corroded together. I’m considering trying to suspend the hinge in a tub of Blaster. I just need to keep the back cover clear, which is only about 1/8” away.

Rick


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 Post subject: Re: Stuck Piano Hinge
PostPosted: Jul Sun 18, 2021 9:57 pm 
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Joined: May Mon 25, 2020 7:37 pm
Posts: 704
Location: Greater Boston, MA
You could try soaking it in Kroil. That stuff works wonders.


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 Post subject: Re: Stuck Piano Hinge
PostPosted: Jul Tue 20, 2021 4:58 pm 
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Joined: Dec Sun 22, 2019 6:10 pm
Posts: 558
Location: Delavan IL
I make my own rust penetrating lube by mixing half automatic transmission fluid and half acetone.

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