Just remove the drive shell and clean it off really well. Then clean the inside ring drive and spring, relube everything and put it back together. Takes 5 minutes and you don't need the servicing tool. You only need that if you want to remove the bearings. You can even relube the main hub bearings without taking them out. Just pop off the seals, clean, relube, reassemble.
But, your issues are most likely a dirty ring drive.
I just did two of mine mine for slipping/skipping issues. I did the basic disassembly without the tool, wiped down everything I could reach, flushed with WD-40 & let dry overnight then relubed everything with synthetic motor oil for the winter and they've been perfect since. Super easy!
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