The 511 uses some bright shiny aluminium ballstuds which are weaker than the old 501 versions, I sheared one off while threading it into the castor blocks!!
I use the Tamiya 5x8mm hard hex head connectors everywhere, much stronger and still the same size etc. Only difference is to add a 1mm washer under each to replicate the actual position of the kit ones, as the hard hex heads sit closer to the actual screw thread, if that makes sense?
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