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I would not say hard nickel is like armor plate because you can wear right through it .I messed up an 034 Stihl cylinder by using a flap wheel .To repair that one I used an 036 cylinder and an aftermarket piston .Had I not lost my patience and used a less abrasive method I could have salvaged it...

Generally speaking a good job of plating will hold up a long long time providing it has good lubrication and air filtration .Some of the older brands like McCulloch had some problems towards the end of their production with quality plating but it's pretty rare .You need to remember the function...

Well if you cut to the chase it boils down to good air filtration and proper oil ratios in the fuel .I just recently rebuilt a pair of Partner P-100's that date back to the late 70's early 80's .Not a blemish on either the pistons or the cylinders .Dirty air will eat them up as badly as too...