178 respectively cylinder extension 178 is provided with a front plate 197 releasably fastened such as by bolts to provide an alignment or bearing surface against which backplate 112 of bullnose latch 70 comes to rest as clevis 64 is retracted into cylinder extension 178 in the fully retracted position front plate 197 and backplate 112 will abut each other thus assuring proper coaxial alignment of the flow axes of inboard hub 14 and outboard hub 38 and proper positioning of outboard hub 38 a predetermined horizontal distance from inboard hub 14 piston rod 180 has a central axial bore through its center as shown in fig4 to slidably and sealingly receive telescoping member 168 to allow the passage of cable 40 therethrough telescoping member 168 includes an inner sleeve 188 and outer sleeve 190 cylinder head 172 includes a conduit for outer tubular sleeve 190 to pass the cable 40 out through the end of cylinder 160 inner sleeve 188 includes a flanged portion 192 affixed to one end of piston rod 180 and is also supported by an annular protuberance 194 within piston rod 180 support 194 strengthens piston rod 180 near the mounting of pinion gear 164 outer sleeve 190 of telescoping member 168 includes a flanged portion 195 attached to cylinder head 172 o rings 314 provide a seal between sleeve 190 and head 172 outer sleeve 190 extends into the bore of piston rod 180 and telescopically receives the free end of inner member 188 piston rod 180 protrudes into piston bore 170 for threading engagement with piston head 179 piston head 179 has a pin 310 at the point.