It is straightforward if you follow the steps, have hands the size of a 10 year old, are very thin and do daily yoga
I didn't reuse the push rod, but that might not be a bad idea. Mine just fell apart after it came out of the assembly and I assumed that was because of the internal seal failure, but perhaps it is designed this way. You are going to find out I suppose so a report back here would be helpful for others who go down this path.