Upside down plug in lock?

[xeo]

Pin 1, 2, 4 and 5 seem to just go up and down but pin three doesn't move at all. I think that is what the problem is.

Sounds like a spring is binding at the shearline perhaps. Can you take a light and look inside at all?

[mister sour]

what kind of padlock is this?

[jeffmoss26]

I've been able to drill those retaining nuts out and take the cylinder out on Master and American padlocks.

[jeffmoss26]

I had a master pro series without a key and I bought new retaining nuts and a replacement cylinder with keys.

[NNFAK]

what kind of padlock is this?

It's just a Master pro series but I like to have all my locks working.

Sounds like a spring is binding at the shearline perhaps. Can you take a light and look inside at all?

I will take a look. I did what you said and it help (everything got a bit easier to move) but that damn pin messed it up. If that spring is in the shearline how do I fix that?

[Warder]

Master 6121 did that to me once, I had to drill it

[mastersmith]

Most padlock won't turn 180 degrees, what brand/model is this?

[femurat]

If that spring is in the shearline how do I fix that?

I'd try to set everything else and then slowly force it down with a filed key and a rubber mallet.

Cheers