Not much at all. I made my own spring compressors, Stator Shaft and imput drum sills installer. When you look at the spring compressors you will see they are easy to make but if you purchase I seen them as low as 20 bucks. For the Stator Shaft and input drum sills that is an expensive tool, but here is what I did. The tool allows you to slip on the sills and the use another plastic piece to slide over the shaft when the sills are installed. This allows the sills to conform to the shaft. So what I did was cut some small plastic paint mixing bucket, put the sill on it slide it over the shaft and install the sills. After all the sills were install I used my fingers to conform them to the shaft the best I could. I then used that same plastic to wrap around the shaft. I use zip ties to hold it together and pulled them as tight as I could. I also use zip ties on each sill. Waited around 30 min. and the sills were conformed to the shaft.

But if your sills are in good shape you really don't need to replace them.