After a long search on google I'm coming to you gals like I should have to begin with. I'm helping my aunt "modify" grace queen quilt frame. We are wanting to replace the plastic tracking with the metal rods. Could one of you tell us how to remove the plastic tracking? I'd also like to know if replacing them with metal rods helps with the wobble in the carriage. If not do you know of a fix for the wobbly carriage? Thank you so much for sharing you knowledge.