There a few of these on the net, but I came across this VIDEO (hit play for 10 tips)
and found a few new tricks.
I especially liked the first one about cutting the bolt.
In the video I would have added one more nut on the side with the bolt head on it
(they have used 2 in the pic above) so that the thread is intact.
To make it perfect, you just put the bolt in a vice, the jaws grip the nuts as not
to damage the thread slightly dome the recently cut end then simply wind the nut
off and any dags come off at the same time.
I've used the soap on screws for ages, taught to me by my Dad.
Feel free to add any HANDYMAN HINTS you've used over the years.
Photos always help.