I am getting ready to do a valve stem replacement on my 87 560SL. Do I need the "magnetic finger" tool to remove the valve cone halves ? What does this tool really do ?

Also, I am thinking of borrowing a valve spring compressor from autozone or advance auto......should this tool work OK for me, if I use duct tape as mentioned in previous posts ?

Also, I am trying to make up my own attachment to pressurize the cylinders...I have a regulator with guage, but will need to, somehow, go from a 1/4" NPT fitting to a standard spark plug fitting....any ideas on how to do that ?

Thanks in advance,

Brian