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Message: <blockquote data-quote="John" data-source="post: 993577" data-attributes="member: 175005">Ok re: Wim's testing for the top and bottom step gap... Just wondering,  what is the metal thickness you have used of the flat bar used for the top and the bottom steps,  were they the same thickness for both or was there the two different thicknesses used the same as the original ADL & AV-Comm barrels ? ...  i would have thought using a 63mm ID tube with the step flat bar thicknesses for both steps of 6.5mm ish ..x 2 should leave a spacing in the region of 49.2mm ish from between top and bottom steps.   AV-Comm told me that they thought the barrel's  were not especially too frequency fussy so i would have thought you were in the right ball park</blockquote>