Has anyone ever read "the spring air rifle tuning and service manual" By TR Robb. (vol 1)

A friend has lent it to me, and I was wondering if any of the infomation is of any use?

If so, my HW77 is going to get another fettleing, as now I a have a PCP, the recoil seems Sooooooooo harsh. Or have I just gone soft??


Pete