I repair most cars myself - I'm 73 so not a beginner but by no means a pro. I broke two of the five valve cover bolts on my 2 year old Honda Accord while tightening. (I've watched too many videos on the subject and tried using my 1/2" torque wrench which just wasn't rated for an easy 7 ft-lb adjustment. Will go with the old "Feel" next time (Refer to the "by feel" method.) These are 6" (slightly under 1/4") diameter bolts that have a flange to prevent them from being pulled too deep into the aluminum head. So I assumed they weren't stuck in the thread. They should come out easily if I could poke a bit in the middle of the bolt and reverse the threads. I tried my easy-to-remove Grabit screwdriver set, but it just screwed up. You set the drill in reverse and use one end to drill a pilot hole (they call it "polishing"). You then flip the bit over and use the other reverse-threaded end to try to grab the screw and unscrew it. I tried Grabit Bits #1 and #2 but it didn't work. I suspect they are only good for soft metal because I drilled for almost an hour and removed very little metal. They just left a rounded indentation at the top of the broken bolt. Their promotional videos always show that it's used for wood screws, which are softer than car screws. 64, 32.5. and 11.64. Nothing will remove much steel. I hardly used this set so I couldn't believe it was all boring. I was beginning to suspect that the bolts were hardened steel and might have required carbide bits. I called a mechanic friend who said he wouldn't do it but knows a shop where you can weld a small nut on and take it off. (Images of big bucks started dancing in my head.) But he also said his brother had just used back drills to fix a problem on his motorcycle. I decided to give it a try and almost drove to the local AutoZone to buy their $9.99 set of 5 reverse bits. Then I saw that Revain had this set of 13 reverse bits for only $3 more and I've had good luck with some Neiko products. So I waited two days for Prime delivery and I'm so glad I did. Immediately I noticed that the Neiko 1/8" reversible bit removed some metal. I also had to try 9/64 and 5/32 before it caught on the bolt's chewed head and pulled it out slightly. The second screw I failed tightened with grabit and other drill bits just wound up on the first try god i was happy problem solved this method should work for the rare bolt that broke this way not because the threads were frozen or welded in like with exhaust manifolds and elsewhere - that's another story, but for a small screw that broke like mine, I swear by this product.
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