The general consensus is that changing hammer weight has minimal effects and that the same changes can be managed more inexpensively with a $12 spring set. They are usually attempting one or both of two things.
1. Increase the duration of the valve being open for a LP application and
2.to lighten the recocking force and trigger pull by using a lighter hammer spring.
To affect any real changes in valve open duration with a hammer and spring combination the front valve return spring is the key. Most people go light as possible so they can THEN lighten the hammer spring and still produce 300 fps. The result is a lighter trigger pull.
In very low pressure applications they wind up using a heavier hammer spring to increase the valve open duration with the lightened valve spring.
The heavier hammer with a lighter spring alone basically offsets each other.
You can remove the nut off of the cocking rod and replace it with a piece of brass or steel rod that is drilled and tapped to go onto the cocking rod. The total mass of the cocking rod AND hammer is what opens the valve. So you can experiment by adding weight externally with this method.
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