There is a link somwhere about this i found 5 years ago. All you need is 2 pieces of pvc pipes and a rope. It is what i used. One pipe is 3/4" about 1' long and the other in 1" about 8" long. cut a u shape in the bottom of the 1" pipe (so you can get the keepers out. insert rope into combustion chamber throu the spark plug hole, use wrench to compress the rope into the top of the head, Then place the 1" over the spring and place the 3/4" inside of the 1" pipe and push down on the 3/4" pipe to compress the spring, and remove the keepers.
Im not sure about the pvs size i did this over 5 years ago. But it dose work, and dam good as well, and cost less then $2
Dose any one have the link to this?????????