no, just stood astride it, leg either side-key thing is to tap the spindle out with something that will sit in the pivot holes. That way the hatch can only open and close-it can't fall out.
for added safety I would suggest a couple of wooden blocks over the open and closed side, so if you drop it, or need a rest, the hatch can rest on these still slightly raised.
remember to tap the spindle out of the first pivot, placing a bar or similar in the hole. Tap the spindle back flush to the second pivot to allow spring replacement-that way you still have the spindle in one 'hinge' and a good solid bar in the other 'hinge'
good luck
ps-if you need a spring, contact 'H'