Not knowing how old and used your mdl 60 is, I would suggest the following.
1. Get another hammer to practice on. They are not going to cost that much, and if you like the result, you can replace the original hammer and store it for later.
2. Get a new spring kit. Don't try to adjust the tension of the hammer spring, you'll only end up with light hits on the primer.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)