[tada]

I was able to trace my oil leak down to a camshaft plug, the green ones. How hard is it to replace? It looks like you can jam something through the center and pull it out. But from the articles I have read, it looks like they need to be tapped back into the cam cover with a rubber mallet. My engine is still installed and I don't see any room to tap with a mallet. Is there another way to push them in with the engine installed?