thanks for cking and responding BlazNT.  reason I ask is a friend had recently borrowed my original wacker and apparently had bad trouble with weeds wrapped so she had taken it somewhere and I noticed a sleeve had been placed around the shaft just above mowball.  Unfortunately it was then discovered that valves had been damaged resulting in having to get a replacement wacker.  Thinking about the sleeve it looks like it might work, but I fear trying it on the new wacker may void the warranty if I have trouble.