Here are the internals:
Drag washers were upgraded to Brand New Smoothdrag Carbontex.
Stock drag washers of all Revo reels are also made of Carbon fiber but the material that the manufacturer used is inferior compared to Smoothdrag. They do not last long. After a year or so, they will flatten and lose drag strength. In addition, only the three main washers are carbon the washer under the main gear is made of felt paper.
Stock Drag Washers:
Carbontex can be ordered from smoothdrag.com. Here you can see the fiber mesh of Carbontex. The fibers are obviously thicker, stronger, and smoother.
In addition to the three main washers, you will get a thick Carbontex washer that will replace the felt washer under the main gear.
Drag star and clicker were replaced.
Because the stock washers of the Revo series will wear down fast, you will lose drag as you use the reel especially if the reel is used on larger fish. The tendency is to tighten the star further. Unfortunately, the stock drag star is made of aluminum. In the end the threads will strip.
Fortunately, I found a better replacement. The star drag from Abu Garcia Silvermax. You can see the insert is sturdier. The clicker was from Silvermax as well. Because the Drag Star of Silvermax is a bit taller, you will need the clicker assembly from Silvermax to get a perfect fit. You can also use the stock Inshore clicker but your Drag Star will sit a bit higher.
Stock Drag Star:
Bushing on the Handle Paddles Replaced with Ball Bearings
There are four bushings on the paddles of the handle. You can replace them with stainless steel ball bearings. The size is OD=8mm, ID=4mm, and 3mm thick. After replacing, the handle will be as smooth as a Revo STX or SX. But, you need to make sure that they are Stainless steel. Otherwise, they will rust when exposed to Saltwater. I did replace my paddle bushings with ball bearings and it was soooo smooth. Unfortunately, the ones I got were not Stainless Steel bearings but rather the Chrome Steel type. After a few outings in Saltwater, they corroded so I needed to take them out and return the bushings.
Ceramic Bearings on the Spool
Now, if you want to improve the casting distance, you might want to try upgrading them to Ceramic ABEC5 or ABEC7 bearings. Here are the dimensions:
ID 3mm x OD 10mm x Width 4mm
ID 5mm x OD 11mm x Width 4mm
You can order them from Bocabearings.com or Smoothdrag.com or ebay. After the upgrade, it can outcast a stock Curado, that's for sure.