Please suggest a tool to hold this bolt

lukedlb

Which tool do I need to hold this bolt in place while I tighten the screw? It’s holding the power valve and I believe it is the source of a rattle when playing an A. Pliers didn’t work. 
If you have an amazon link, I’ll order it immediately. 
I don’t want to move the circuit board unless I really have to. The bolt is only just beneath it.

https://imgur.com/gallery/K0VuM1Z

https://imgur.com/gallery/lRuzk0I

ICBM

A tube spanner or a pair of flat-nose pliers.

Be prepared for the bolt to snap - they often do, coming loose is usually a sign that the thread has stretched.

stickyfiddle

I'm gonna say "longer pliers?" 

Or a socket set with a fairly (slim) bendy snake attachment?

lukedlb

ICBM said:

A tube spanner or a pair of flat-nose pliers.

Be prepared for the bolt to snap - they often do, coming loose is usually a sign that the thread has stretched.

Yes, I did wonder how it came away from the chassis seeing as it was marked with the old nail polish. What is that red stuff they put on every bolt? Fingers crossed it won't.
And fingers crossed this is the final source of the rattle in my amp.

lukedlb

Next time I open the amp, I have mini tube spanners on a driver that might work if it isn't too far under the circuit board. Failing that, a mate says he has a solution. But then he is a plumber, so who knows.

phil_b

a socket with a universal joint

lukedlb

phil_b said:

a socket with a universal joint

Sir, that is exactly what I need.
I wonder what size, though.

Rocker

The 'red stuff' put on bolts is very likely to be Loctite.  It locks nuts to bolts, preventing the disassembly resulting from vibration.

lukedlb

Rocker said:

The 'red stuff' put on bolts is very likely to be Loctite.  It locks nuts to bolts, preventing the disassembly resulting from vibration.

ah-ha! Not in this case it didn't. Should I get some? I wouldn't want the bolt to unthread again.

Phil_C

lukedlb said:

Rocker said:

The 'red stuff' put on bolts is very likely to be Loctite.  It locks nuts to bolts, preventing the disassembly resulting from vibration.

ah-ha! Not in this case it didn't. Should I get some? I wouldn't want the bolt to unthread again.

Can never go wrong with thread-loc

There are varying strength though. Some just to prevent loosening from vibration and some ultimately near-enough permanent ones which requires some serious torque to loosen.

ICBM

It’s not Loctite, it’s just something quite like nail varnish which they painted onto the bolts and solder joints to show they had been checked and reveal any unauthorised out-of-warranty work.

I’m not sure why you can’t reach that bolt with either a tube spanner or pliers, I never have trouble with them.

lukedlb

Phil_C said:

lukedlb said:

Rocker said:

The 'red stuff' put on bolts is very likely to be Loctite.  It locks nuts to bolts, preventing the disassembly resulting from vibration.

ah-ha! Not in this case it didn't. Should I get some? I wouldn't want the bolt to unthread again.

Can never go wrong with thread-loc

There are varying strength though. Some just to prevent loosening from vibration and some ultimately near-enough permanent ones which requires some serious torque to loosen.

just to prevent loosening. any recommendations?
https://www.amazon.co.uk/s?k=threadlock&ref=nb_sb_noss_2

lukedlb

ICBM said:

It’s not Loctite, it’s just something quite like nail varnish which they painted onto the bolts and solder joints to show they had been checked and reveal any unauthorised out-of-warranty work.

I’m not sure why you can’t reach that bolt with either a tube spanner or pliers, I never have trouble with them.

Poor pliers. A tube spanner, even just the separate head from a kit would do; however, all mine are way too big. In the end, I just need the tube spanner head so I can block it with my fingers. As long as it isn't too tall, I can get it under the circuit board and hold it there.
Yes, I remember seeing the red varnish in other marshalls to show where it's been checked. I did wonder if it had a sealing purpose too.

lukedlb

Those proboscis looking pliers did the trick. All nuts and bolts tightened. 
Did it help solve the rattle? Did it xxxx!