84-008 vs 84-008M?

A home owner from NY says:
My question is what is the difference between the 84-008 and 84-008M? I see the obvious of steel vs nylon but my question is if one is more durable? I have to get a replacement because my 2yr old son ran into the screen and must have kicked it wrong (or right depending on how you look) and the metal piece that you screw in broke off. Prior to this though we were having trouble rolling as it was getting stuck. So, I'm wondering if the steel one is more durable and do I need to purchase that lubricant? First time home-owner so I just don't know and any help would be appreciated.

I've read that I should get two and I plan on it.

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Dave Sr. from SWISCO responded:
Thanks for posting! Yes, the 84-008M is more durable, however keep in mind that as a metal roller it is more prone to rust in salt or moist air environments. As for your door getting stuck, I would first look over the track to make sure there are no dents or other damage that would interfere with the operation of the door. I would also spray it with a silicone-based spray before installation, should you choose to go with the metal roller. That should help prevent corrosion.
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