Take a deep breath and relax.A twenty degree bend in your mast is a definite Oh S**T. If you try to straighten a bend of this magnatude you will end up with a VERY weakened structure. The only saving grace is where it is. At this location you MIGHT get away with straightening it. Higher up or closer to the foot of the mast and I wouldn't try. Place the mast on two saw horses, each 1/4 the length of the mast from each end. With the high side of the bend up streach a line between the head and the foot of the mast. Don,t secure it with hooks at the end or on cleats or masthead fittings, but by wrapping the line around the mast. Use 3M Spray adhesive to give the mast a tacky surface to prevent the line fron slipping. Over the high spot of the bend place a wooden block about 1 foot long, with a three foot long cross member standing straight up, It should look like an old fashioned T square. At the other end of the three foot section attach a small compound block and tackle (about 6 to 8 dollars at harbor frieght). Hook the free end of the block and tackle to the line streached along the mast and place the 1 foot wooden block on the high side of the bend.By hauling in on the block and tackle you will streach the line that runs from the head to the foot of the mast. This is kind of like pulling on a bow string, The more you pull the more the bow bends. Unlike a bow the mast will not spring back to its' original positon. Straighten it out a little at a time and check for straightness with a masons line or a chaulk line. Check with one side of the mast up and then the other. Take it slow and do not over bend as you will have to bend it back and this will weaken it further.Remenber that your mast will be weaker than normal and this is always risky. If the mast buckles, DO NOT USE IT. Compared to the cost of a boat, a mast is relativly cheap.If the mast is beyond repair you might check with Perko, they sell replacement masts. If the cost of that is too much for your budget you might laminate a wooden mast for your bost. A properly built wooden mast is strong and light and varnished wood always makes a boat look better.Best of luck,Mike