+1(s) on using a rope to support the shaft at level, and keeping them telescoping well. If both sides are a quick connect style, I'll hook up the tractor side first, since thats the harder to get at.
If you can tie a clove hitch--you can tie the midshipmans hitch (it's an extra wind to the inside, though I find the extra wind done outside the loop ties, slides and grips slightly better.) Slide the barrel of the knot to the desired height and a dogleg forms to hold when pressure is applied. Works like the prussik knots.
Also great for tensioning lines, tying a tow rope for quick release, holding things at varying levels, and being an extra set of hands. Best knot ever.