loosening stiff joints leatherman

Mungo

Well-Known Member
I have an old (15 years +) Leatherman SuperTool.

The joints are very stiff. Can anyone suggest how to loosen these?

Thanks!
 

Alantoo

Well-Known Member
I put a drop of sunflower or olive oil onto my pocket knife joint area when it stiffens up.

I don't fancy mineral oil in my pocket or on my hands.....and it is further to walk out to the shed than the pantry.

Alan
 

Alantoo

Well-Known Member
Thanks folks. I’ll give the coke a go. I’d forgotten that...
The phosphoric acid in coca cola is great for dissolving Aluminium oxide, but not much good on dry Stainless Steel joints. It is not a lubricant.

Lanolin, Graphite, wax, vegetable or mineral,oil, talcum powder, silicon oil, PTFE will help lubricate the joints. They all have advantages and disadvantages depending on how you handle your knife and what you use it for, but all lubricate.

Alan
 

Mungo

Well-Known Member
The phosphoric acid in coca cola is great for dissolving Aluminium oxide, but not much good on dry Stainless Steel joints. It is not a lubricant.

Lanolin, Graphite, wax, vegetable or mineral,oil, talcum powder, silicon oil, PTFE will help lubricate the joints. They all have advantages and disadvantages depending on how you handle your knife and what you use it for, but all lubricate.

Alan
I think the main problem is crap in the joint. I need that out before lubricating.
 

Alantoo

Well-Known Member
I think the main problem is crap in the joint. I need that out before lubricating.
Depending on what the crap is will determine the best way of flushing it...but if it is just the standard dry SS joint I would just try a drop of vegetable oil before you do anything else...allow enough to get around the spring as well, work it a bit and then wipe off residue with kitchen towel.

Vegetable oil can readily be flushed out with alcohol or detergent if it doesn't do the trick...

KISS.

Alan
 
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Mungo

Well-Known Member
Depending on what the crap is will determine the best way of flushing it...but if it is just the standard dry SS joint I would just try a drop of vegetable oil before you do anything else...allow enough to get around the spring as well, work it a bit and then wipe off residue with kitchen towel.

Vegetable oil can readily be flushed out with alcohol or detergent if it doesn't do the trick...

KISS.

Alan

Thanks.

I have tried the veg oil, and it didn't help.

I'll work through the options.

Matt
 

Treedave

Well-Known Member
If it’s just rubbish in the joint try soaking it in water fresh from a boiling kettle with a little washing up liquid in. Leave a few minutes, then work the joint and put back in the hot water - repeat till the steel is the temp of the water. It’s surprising what drops out as any grease is stripped out.
It will need lube of some description once it’s clean & dry - I like graphite powder as it doesn’t act as a trap for dirt etc and is hard to wash off.
 

Mungo

Well-Known Member
So - attempt 1, with overnight soak in Coke had no effect.

Attempt 2 will be the boiling water and wiggling.
 

Alantoo

Well-Known Member
So - attempt 1, with overnight soak in Coke had no effect.

Attempt 2 will be the boiling water and wiggling.
Can't say I didn't tell you Coke would be no good...Phosphoric Acid pickling tanks are made of Stainless Steel...because it is resistant.

Phosphoric acid is great on iron and aluminium oxides but not the chrome and nickel oxides of Stainless...

Of course now you have the sugar to get out of the joint as well! :)

Is the joint so loose that there was room for grit to get in and bind it? Can you think what the contaminant might be so you can use an appropriate solvent for it...

Can't help thinking that if it is surface galling from lack of lubrication, boiling out any remaining lubricant while wiggling it might just make it worse...I would rather float out any crap using oil.

Alan
 
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