Sorry about not responding earlier!
The "weight" (mass under gravity) of a putter matters in a number of different ways: swingweight, overall weight, inertia, momentum in swing, momentum transfer to ball, and vibrational transmission. Let me just sketch out the main directions of difference:
1. Swingweight: heavier head = more awareness of putter head on end of shaft
2. Overall Weight: heavier head helps arms and hands stay hanging neutral
3. Momentum in Swing: heavier head will tend more to stay in same swing direction
4. Inertia: heavier head takes more to start back and to stop and change direction
5. Momentum Transfer: heavier head imparts more momentum to ball for same stroke speed
6. Vibrational Transmission: heavier head absorbs more impact vibrations and damps feel in hands
With these effects in mind, you want the putter weight to fit well with your body, the greens you usually play on, and your stroke. here are the main directions for these factors:
1. Body: heavier, meatier arms and hands generally need a heavier putter
2. Greens: conventional wisdom holds that faster greens call for lighter putters, but I disagree
3. Stroke: quick-tempo strokes are better suited to lighter putters and vice versa
So let's get specific. Take me, for example. I'm 6'1" tall, weigh 160 pounds, have 34" sleeve lengths, play on greens typically around 10 on the Stimpmeter, and have a slow tempo. I'm not especially meaty, play sort of fast greens, and have a slow stroke. So my indicators are: light-to-middle weight for body, middle weight for greens, heavy for stroke tempo. That tells me that light weight is pretty much out and my choice is between middle weight and heavy weight. As it turns out, I tend to pick putters with head weights around 350 to 375 grams -- to the heavy side of the conventional range. (See this
Flatstick Forum post for details.)
The main "bad thing" you want to avoid in favoring a heavier putter head is Inertia at the start and at the directional change at the top of the backstroke. No matter how slow and relaxed your stroke, with the tendency to mitigate this inertia issue at the start and transition, a too-heavy putter will cause problems at the takeaway and at the transition. The delicate judgment or assessment that should be of most interest is how much mass can you add to the putter head before the takeaway feels less fluid and more "hitchy" than you like -- where is your personal cross-over point. So long as you keep adding weight without making the takeaway skippy or jerky in any degree, then the weight is probably all to the good: more feel of the putter head, more staying in the established stroke path, more send to the ball, a slower stroke and a less-long stroke on fast greens, and a better overall fit with your body.
The general direction is towards heavier = better, so you want to build up from the lightest commbination in your putter to the point where adding further weight is causing problems. Adding further weight will not cause problems on fast greens except in the rarest cases -- some OTHER factor will suggest you stop adding weight before that problem surfaces.
If you put the onus totally in the feel of your hands to sort this out, what you are looking for is a stroke that does not require anything other than smoothness in the takeaway. This is the key point in the stroke where the putter is most resistant to your effort, so you want to get a resistance level (mass inertia) that you can handle without skippiness. Bigger boned, more massive armed golfers can handle a more massive and more resistant putter.
In response to the question about pendulum vs. handsy stroke style, a pendulum style is a "dead hands" style so heavier is genreally better. On the other hand, a handsy style requires more precise information in the hands about the changing situation of the putter head and the putter face during the stroke, so swingweight is a bigger factor for a handsy style than it is for a pendulum style. Even then, the general trend should be towards slightly heavier putter head than normal, as heavier is more swingweight feel, at least up to a point.
"Go tell my captain this 9-pound hammer is a bit too small." -- John Henry
I hope this helps.
Cheers!
Geoff Mangum
Putting Coach and Theorist
PuttingZone
http://puttingzone.com
Golf's most advanced putting instruction -- you're either in the PuttingZone, or not.
