You could go to a repair shop and they can put an extender in the end of the shaft to get it to your desired length....not positive though that this wouldn't change the feel of the putter during your stroke.

Best advice though is to send your putter into the Scotty Cameron Custom shop and have them re-shaft the putter and adjust weights as required.

That's interesting that you received a 33" putter as a gift, as most shops don't carry 33" putters. Most of the putters in a shop are usually 35" and some 34" putters.

But with shorter putters, the weights (in the sole) and swing weight. Depending on what you want, you can just send it back to the Scotty Cameron Custom Shop, so you know the club gets fixed to what you want or if you just want to extend it, you can just take it to a pro shop to have an extension added and then a new grip put on.

But I would suggest to send it back to the Scotty Cameron shop.