Caution, Miles dug out somewhat outdated info there. Please check here: Things to do first with a new J1 - NLGI class 1 or 2 seems best for the linear raills of the J1.
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Caution, Miles dug out somewhat outdated info there. Please check here: Things to do first with a new J1 - NLGI class 1 or 2 seems best for the linear raills of the J1.