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REV XP Nut
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Use a small acid brush and dab it on the aluminum it will turn black and smoke keep dabing it on till its gone and hone cyl ckeck for cracks and flaking
 

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Mod'n is my thing
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Do as above use a wood stick like a popsicle stiick with a sharpened edge and work it on the affected area, this will work and loose up the aluminium and allow the acid to penetrate quicker for a easier removal and limit the damage to the cylinder coating..
 
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