I have a small run down of oil on cylinder 5 causing spark plugs to foul out. I half to replace the spark plug every couple of months. My step dad said that I can buy a tool called a Valve Holder and I can replace the seals on that one side without pulling that head. Well that made me happy because I didn't want to have to spend a grand to have a shop due it. So how does this tool work and what other too;* may I need to due this kind of job. Also if yall could give me detailed info and maybe some link to videos or pictures it would be greatly helpfull. Also I have found the tool on ebay for less then ten bucks. Thanks.