The timing might be reset fairly easily, if the problem is just the tension of the fork at the rear of the bolt. Remove the bolt and see if the rear "wings" are parallel or not. Preferred is a slight spreading of the forked wings to put tension against the hammer at the hammer's cam, this will prevent premature falloff as long as the cam is sharp and the rear surfaces of the bolt are not too worn.
Hold the bolt in a vise and take a screwdriver and carefully spread the wings a bit, do't break them. It is a lot more work to refit a new one. Also helping would be to reduce the bolt spring's tension with either a Wolff SAA spring or flattening it slightly in a vise. (careful, too much is easy to get).
Any gunsmith who can do Single Action Colts can properly do the job, the parts are essentially identical. New bolts can be had from VTIgunparts.com.