Did Evaporust destroy my NOS 4 jaw chuck?

[Lo-Fi]

Did you take any before photos, @Shootymacshootface ?

 

[Shootymacshootface]

From your photos i would “ASSUME” those threads would still work fine.

I do plan on using it until it doesn't work anymore.

Did you take any before photos, @Shootymacshootface ?

I wish I had, but I assure everyone that they were in perfect condition before I got to it.

 

[extropic]

Regarding the "clean before de-rusting" issue. Yes, that is recommended, to get the maximum life (usefulness) from a quantity of Evaporust. However, I've soaked some filthy steel parts for extended periods without noticeable deterioration to the parent metal. I don't think contamination from dried oil/grime caused the deterioration of the threads. I have no hypothesis (except defective parent material) to explain the deterioration pictured. It's a puzzlement to me.

 

[Shootymacshootface]

Ha ha, I do remember reading the label, and it saying something about the detergents and it not being necessary to degrease your parts, it may just take longer to work. Oh, and it won't harm metal.