David C, As I said, I intend to use oil, not grease. However, I think that even semi-fluid grease would do a good job. All racks that I've come across over the years use grease. I can't think why oil would be absolutely the only lubricant that could be used. I can't see anything in the rack that demands oil, not grease. Could it be that grease can't be pumped through a 'system' easily, whereas oil can??
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