Help With Mounting Amp Chassis.

Lamf77 · Tue Dec 19, 2023 4:05 pm

So I got an old Marshall Lead 20 awhile back. I removed the chassis to spray the pots today....scratchy! When I went to put the chassis back in...one of the screws seems stripped...but held. No worries. Then I heard a rattling inside. Couldn't leave it like that! When I took it apart again, I noticed one of the chassis mouning clips was brokes. The previous owner glues a piece of plastic to the inside of the chassis to hold it (see right part of chassis in photo). Now it is not holding. The square is 10mm each side the the screw is about 5.6 mm in diameter....I know it's not the official measurement. What are my options here? I looked fo replacement clips...could not find any....then again I don't know if they have an official name I am missing.
Any help greatly appreciated!

Partscaster · Tue Dec 19, 2023 6:30 pm

I dont see enough to make sense of the situation,..but can you superglue a nut somewhere for a new bolt to line up with?

Or, is this one?
https://www.mojotone.com/Metric-Cage-Nu ... ll-Chassis

Lamf77 · Tue Dec 19, 2023 7:28 pm

Partscaster wrote: ↑Tue Dec 19, 2023 6:30 pm I dont see enough to make sense of the situation,..but can you superglue a nut somewhere for a new bolt to line up with?

Or, is this one?
https://www.mojotone.com/Metric-Cage-Nu ... ll-Chassis

I may need to do that. Find a nut that fits the screw and superglue. I am not sure they carry the black clips or anything close...thanks.

Tue Dec 19, 2023 7:37 pm

An auto parts store might have something that will work...

Tue Dec 19, 2023 10:49 pm

Upon further reflection and assuming that the broken one you're talking about is on the right-side flange, then one of those nut/clip combos like the one that @Partscaster linked to should solve the problem. I'd be proactive and replace the one that's still good as well, because you know how the universe works, it will break very soon after you replace the one that's already broken. I'd also pick up at least three because one will definitely disappear into thin air, not to be found until long after you need it, if ever.

Any of the large auto parts stores should have an assortment of sizes, and I'm pretty sure I've seen them at HD/Lowes although the selection of sizes was limited...

deeaa · Wed Dec 20, 2023 12:44 am

Lamf77 wrote:So I got an old Marshall Lead 20 awhile back. I removed the chassis to spray the pots today....scratchy! When I went to put the chassis back in...one of the screws seems stripped...but held. No worries. Then I heard a rattling inside. Couldn't leave it like that! When I took it apart again, I noticed one of the chassis mouning clips was brokes. The previous owner glues a piece of plastic to the inside of the chassis to hold it (see right part of chassis in photo). Now it is not holding. The square is 10mm each side the the screw is about 5.6 mm in diameter....I know it's not the official measurement. What are my options here? I looked fo replacement clips...could not find any....then again I don't know if they have an official name I am missing.
Any help greatly appreciated!

Dang, I think I have a broken lead 20 chassis here somewhere, but probably ain't worth shipping across the world for one little part. Best bet is probably find a replacement in some nut&bolts specialty store.

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andrewsrea · Wed Dec 20, 2023 11:54 am

It is called a chassis clip nut and these fit most Marshalls: https://reverb.com/item/74189654-marsha ... 6-d2031cnp

Partscaster · Wed Dec 20, 2023 5:30 pm

tobijohn wrote: ↑Tue Dec 19, 2023 10:49 pm I'd be proactive and replace the one that's still good as well, because you know how the universe works, it will break very soon after you replace the one that's already broken. I'd also pick up at least three because one will definitely disappear into thin air, not to be found until long after you need it, if ever.

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deeaa · Wed Dec 20, 2023 11:54 pm

Damn those are some expensive nuts! I had like 100 of 'em, I got this computer rack once four feet tall that had 19" slots all equipped with those exact nuts in square holes.

They might be available somewhere else for cheaper by boxes if they've also been used for IT racks etc.

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Lamf77 · Thu Dec 28, 2023 1:22 pm

andrewsrea wrote: ↑Wed Dec 20, 2023 11:54 am It is called a chassis clip nut and these fit most Marshalls: https://reverb.com/item/74189654-marsha ... 6-d2031cnp

Fixed. A project which actually went as planned! I followed @tobijohn Law....which is to have enough foresight to circumvent Murphy's Law........so I changed both mounting nuts. So if any one has old Marshall Lead Solid States...or Park Amps...you know the nuts you need! Thanks all!