The WILSON preselector gearbox and the various designs by licensees such as Armstrong Siddeley, Daimler, E.N.V. or Talbot have been objects of my intense study in theory and practice for a few years. And since the beginning of 2012 I have been offering a full repair and overhauling service for these gearboxes with my company pbm engineering. This website shows a range of work that I offer in respect of a part or full revision of your preselector-box.
Today, there are only few companies and "hobby mechanics" in Europe that are still able to undertake professional repairs of these complex preselector-boxes. The precise adjustment of the gear box is an even more sophisticated task many mechanics have foundered on.
I guarantee reliable, fast and professional work at reasonable rates. Once your gearbox has been delivered to me I compile a detailed status report by inspecting and, if necessary, partly disassembling the gearbox in order that I can make a precise cost estimate. (My suggestion: take some hours to deliver your gearbox yourself and be present when I do this please have in mind to arrange a time in advance). My invoice details all necessary work procedures and spare parts that have been built in, so it is easy for you to comprehend what work has been done. As additional proof you will get back the replaced parts, of course.
After the work has been completed all gearboxes will be tested for a couple of hours on my test rigg and you will receive a brochure detailing how to correctly fit it in your car plus a CD with a photo documentation of the repair (“before”/”after”). All old parts will be returned.