I think you need a bristol spline wrench . That is what I had to use on my Scott 1-30. If you think you have them all out, heat the base up real good with a hair dryer (or carefully with a heat gun) then give the block a rap with a rubber mallet. I had to do that with a Mark 30. Some times they put sealant on the gaskets at the factory which acts like glue. I believe my wrench was a 1/4 inch.
