How To Make Easy Thread Chaser Tool To Fix Damaged Threads 

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This saved me on a 2500 dollar Hydraulic Control Unit on my car ... bolt hole threads were mangled and this DIY thread chaser lined them up again ...I cannot express how greatful I am for you making this video

I discovered damaged threads on one of the throttle bodies on my motorcycle. The screw is an M5-0.8. I purchased a tap, but I was concerned about taking more threads or getting it threaded properly. I looked for a thread chase, but they don't appear to go down to M5. This was perfect! I purchased a couple of bolts and nuts. They cost less than the tap that I purchased earlier. I used a nut to confirm that the threads had not been messed up after I made the cuts. I then confirmed that the bolt easily threaded into another hole before trying it in the hole with the bad threads. With some oil on the threads, I slowly threaded it in and it worked. I used the short side of the Allen key to keep torque applied low. No aggressive tap and no expensive handle. Thanks!

You can also put a little axle grease or petroleum jelly in the slots to catch any debris that's pushed out of the threads.

Just Brilliant and useful, as allways! Thank's!

Thanks! Gonna use this technique for the holes on my LS.

Nice RJ. Super helpful as always

It's 12:30 in the morning and thanks to this trick I can move my truck! Thanks RJ!!!

Worked very nicely . Thanks.

Thank you. I just got a bike with alivio shifters today after watching the video last night on cleaning the shifter I did it. Cool. Great job.

This was useful AND interesting!

Great idea! I have tried to chase threads with a whole screw or bolt, but cutting slots should make it work a lot better.

Neat idea and not just for bikes but just about anywhere around the house.

Amazing. Great trick and thanks for sharing.

genius! another great tip!

Great mechanical worker, tnks man

Ingenious way of fixing threads.

Great tip

Good to know...Thanks

clever and ingenious

great video!

Ever heard of a Heli coil, or a tap and die set? Food for thought.

awesome stuff

R J you are usefull ! tks ! mich

Now this is a very nifty trick to know

great video.

Thank You

very useful

very interesting. may try it on my cranks

Thanks man, I was starting to sweat bullets when I couldn't get my transmission mount reinstalled. Turns out the bolts are damaged and I had to order new ones. I'll try this out while I wait and try to get the female threads cleaned up.

I'm going to give it a try with my crancks!

Nice

Thanks so much for this video! I've had this same problem with my bike, and the local bike shop gave me a shorter screw and said "deal with it." Now I need to run out and find a tool I can use to cut with.

nice this was a problem that i had. unfortunately i dont have access to these tools. what size thread chaser would i need for the vintage 1992 koga miyata bike in your "turn fixie bike back to geared bike" tutorial? also it would be extremely helpful if you wrote the tools you used in each video in the description box in the video. just a suggestion. thanks for the videos.

Awesome. Just saved a socket embedded in concrete!!!

Damnnnn I just did this trick on my powder coated wheels threads were dirty Thank You saved me 30 bucks for a set

Very Good innovation mate! you say Slots funny ;)

I’m having same problem on disc brake calliper. Can’t get the bolts to screw back on. Fingers crossed I can do this and it will work

Do you perhaps have any ideas for a 'home-made' crank arm thread chaser. The appropriate tool Bicycle Research TC-8 is much too expensive.

Can you do a video on how to adjust rod brake bicycles please no one has a video on how to adjust them

Maybe a dumb question, but does this work the other way around? What I mean by that is, could one repair threads on f.ex. a screw using a nut with cut slots inside of it?

Got a trick for a DIY chaser for the bolt threads?

could the same thing be applied to a small engine iv just purchased a used snow blower and discovered I cant thread the spark plug I could Dremel out and old spark plug to make the chaser do you think that would work

What was that little metal bike decal when you were using the Dremel?

How would you go about doing this on bottom bracket threads? Can it be done?

Hey RJ. I want to remove my crank set but i don't have the crank puller. Is there a way to remove it without the tool?

This works best if your bolt is harder than material your trying to chase like aluminum bike frame. The reason why thread chasers are harden.

VITAL INFORMATION JUST RIGHT THERE! thank you very much for this, this will help me a lot in the future, thats for sure

I have a Merlin titanium frame that was in a garage fire and the bottom bracket aluminum parts melted. That's how hot it got. Do you think it's safe to make a fixed gear "fun bike" out of it?

I just keep stumbling onto your McGyver Videos. Tradesmen, bike shops, auto mechanics etc must hate you. You're taking away their lively hood. This is really useful (as well as all your videos). Seriously, how do you come up with all this? I used to pride myself in being a DYI-er/McGyver but you got me beat. Thanks :)

He simply made a tap. Great idea for those who don't have taps or don't want to spend the money...but should not have said that he did not want to use a tap because of metal removal. The slits in his tap screw allow for metal shavings to be removed. Same as a tap.

technically speaking what you made is a tap. if you just use a tap of the same size it will work exactly the same.

As a mechanic your better off using a tap. The screw shouldn’t be loose after the tap if your using proper hardware. If it’s from China you never know what your getting.

One of the oldest sayings in any shop is, "use the right tool for the job." Get your cheap ass to the hardware store and buy a tap the correct size.

You just made a tap.