weights

Hi Dennis, you've not mentioned which SC putter you have but yes you can change the weights to either make your putter heavier or lighter.
Scotty Cameron sells the weight kit and the removal tool on their website www.scottycameron.com/.../cameron-creations.aspx

Yes, this is not a problem as long as you have the five prong wrench.

...Just not during a round...

Changing that headweight can really mess with your stroke. Do you have time to practice on slower greens?

That would save you money and make your game stronger.

I agree with Bob_Roth. I wouldn't change the putter weight to the green speeds.

Deno

Sure, if you have time to adjust. Lighter for slower greens, etc. Seems like we each have a weight that "feels" right. My Newport was a tad heavy so I put a lighter weight in just the toe port. 5 grams made no difference in the stroke but distance control became perfect. Experiment...fun.