Dovetail is the distance from the bottom of the cylinder to the jack casing on a fully compressed buffer. It should only be about 1/16” on these so that when the car does a resync and sits on the springs the jacks are 2-1/2” (buffer stroke) from being bottomed out so the check valves can open and pressure can equalize between all stages. Bottom overtravel must be at least 8-1/2” so there is dovetail and the jacks don’t bottom out before compressing the buffer. This also ensures that when the springs are pulled to manually sync the jacks they can bottom out before striking the buffer stands or you would never be able to manually equalize the jacks.
