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4GSR
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I bet you Starrett changed to wood soon after they received complaints from the government of the rubber not holding up at all to oils they used back then. Rubber in general back then was not very oil resistant as it is today, well almost. Try to handle rubber when it is saturated with oil, it's very slippery. I know this for a fact in a totally different application where we use Nitrile rubber forms that are used as sealing components in oil saturated environments.