The first thing I'd do Rob is to see if its the right length for you ...... in order to see if, and how much, you'll need to add to it.
Do you know what your ideal length of putter is? and how long is the actual putter you have your eye on?
If its a counter balanced putter and it has no weight in the grip, yet its been chopped down, then I assume it probably won't be "counter balanced" at the moment.
The only way to work it out is by trial and error once you actually get it in your hands and see how it feels, then go from there, eg, add length and try it, and then add some weight to it.
Just my thoughts ...
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