I decided to finish the punch list from Mondays inspection. The last item was to tie down the transponder coax in the aft part of the plane. I forgot to think before i crawled into the the area aft of the baggage compartment.I quickly realized my error when the nose rose up and the tail crashed down. Upon inspection everything appears to be OK except the rudder (see picture). I orderdl the parts to make a new rudder!