When I replaced the head of the SDL, I didn't use any tool that I didn't get at Sears or Home Depot. I got the head down to casting, valves, springs and prechambers and took it and the new head to the machine shop.

From what I hear, pulling prechambers is not for mortals. No way I'd attempt that even with prechamber tools.

Sixto
91 300SE
87 300SDL
83 300SD