The tie bar has a first subassembly 114 and a second subassembly 116. The first subassembly includes an end portion 92 configured to connect to a propulsion unit, a first tube 182 that extends from the end portion and a threaded member 160 operatively connected to the end portion and disposed within and at least partially extending along the first tube. The second subassembly 116 includes an end portion 90 configured to connect to a further propulsion unit and a second tube 122 that extends from the end portion of the second subassembly. The second subassembly is configured to threadably engage at 154 with the threaded member 160. The distance of separation between the end portions is selectively adjustable thereby. In a second embodiment the second tube is telescopically received within the first tube.
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