I cleaned the old oil and grease out (nearly all of it) of my mid 80's Silca Floor pump leather cup using ajax dish soap with toothbrush. So now that its pretty dry and suede like agian, what would be a good conditioner that will not weaken the leather? MIneral oil? 3 in one oil? Or just use vaseline? I have idea leaving it dry and just lubing outside rim would leave it prone to tearing apart when in use?