Hornby Dublo spare armatures from my father’s spares which have been in storage for at least 50 years so I have given them a clean and tested.Both are fine mesh and one is the long version and the other is the short version. Insulation and windings are tested and the final test is they are put into a bare chassis with a Neo magnet however any issues always pleased to exchange as I have plenty more but not so many now of the longer version