This is a great Harmonic Balancer Puller set. I used this on my Toyota Tacoma 3.4l 5vzfe harmonic balancer when i did my timing belt, water pump, timing belt tensioner, crank and cam seals, t-stat, upper and lower idler pulleys and belts. It worked flawlessly. Also used this to pull the timing belt/crank gear (loacated behind the harmonic balancer). You use the same threaded center pin against the crankshaft (where bolt threads in), but you have to use M6 bolts (2.5"-3" in length) to thread into the gear. By the way i used additional washers and bolts to shim the M6 bolts to the Hamonic Balancer puller, as the head on the bolts will just slide through the tools grooves. After you thread the M6 bolts to the gear, slighty turn the puller's center bolt by hand and the gear will just slide off. If it doesnt slide off, spray some PB blaster/penetrating oil and let it sit for 5min and try again it will just slide off allowing you access to the crank seal for replacement.If you use this puller DO NOT USE A IMPACT of any kind on this, you will damage the threads to the the puller and you will mushroom/bend the threaded puller face plate. That why these reviews of it mushrooming or bending are happening, DO NOT USE AN IMPACT WRENCH!!! Also, if your harmonic balancer is stuck, spray it and the crankshaft with penetrating oil, let it sit for 5min then try the puller again.This is puller is meant to be used by hand only, not with a IMPACTWRENCH, impact driver, impact ratchet, breaker bar etc etc. Your balancer is held on with a center bolt (19mm), once the bolt is removed thats it. Its either got some corrosion/rust holding it on. Just use the long/short center pulling bolt and any of the other bolts provided in the puller set for the grooves in the harmonic balancer, and thread into you harmonic balancers pulling bolt holes.*Update, I am not a seller, retailer or have any affiliation with Amazon or Astro Pneumatic. I have read review on here saying that "some" reviews are FAKE. Nothing directly pointed at me, but I feel that I should let anyone know that my review is not fake whatsoever. I wrote an extensive review on my use this harmonic balancer puller kit that I used on my 1999 Tacoma Prerunner 3.4l. 5VZFE. DO NOT USE A IMPACT WRENCH, OR A PNEUMATIC RATCHET, ELECTRIC RATCHET ETC. Use a ratchet or a wrench when using this puller! Also, before pulling your harmonic balancer or crankshaft pulley (located behind harmonic balancer on 5VZFE 3.4L) spray both with penetrating oil FIRST, let soak and then use the puller.If you use and pneumatic tools, impact wrench etc you WILL mushroom this puller and snap the bolts. I had no troubles with this puller whatsoever and would buy it again if I had to. It saved me time and money. If you use a impact wrench or any pneumatic tools with this puller and it snaps, mushrooms etc, that on YOU for being dumb and impatient.- Josh McSweeney