I found a product that actually works as advertised so I thought I would share it with you. I'm restoring my original 37 Ford coupe windshield frame and someone had broken off a tap in a blind hole that supports the windshield regulator. A lot of guys just dump these old windshield frames that crank out for the one piece sealed frames, but I think the original ones give the car character so I'm staying with it. I searched the web for ideas on how to get this broken tap out and found this product. Originally invented for the aerospace industry, it dissolves high carbon tool steel while leaving the base metal unaffected. So, if you break off a tap or drill bit in steel, aluminum, whatever, you can dissolve it with this product which comes in a kit; 3, three oz. bottles of degreaser, the acid blend and a neutralizer, a dissecting probe and a chunk of modeling clay to make a "berm" around the hole and hold the acid in place. It all worked like a charm in about 1 hour and I've included these pictures so you can see.

  Ron Lane,  Meridian, ID

Rono.  I had no awareness of the product.  WoW!  THANKS for sharing this info. 

Regards,
Charlie


NoShortcuts
a.k.a. Charlie Brown
near Syracuse, New York

Had no idea this product was available and definitely gives another viable option on removing those broken taps.  Thanks for sharing.

Lorena, Texas (South of Waco)

Does it dissolve the entire tap? Looks like a handy item. Not that I've ever broken a tap before.

Y's guys rule!
Looking for McCullouch VS57 brackets and parts. Also looking for 28 Chrysler series 72 parts. And early Hemi parts.

MoonShadow, 292 w/McCulloch, 28 Chrysler Roadster, 354 Hemi)
Manchester, New Hampshire

http://www.practicalmachinist.com/vb/general/broken-tap-removal-chemical-methods-198135/
Sounds amazing. While searching to see if the product is available here I came across this site that was interesting. Link above.

Glad you found this info helpful. Chuck, it does dissolve the entire tap. The cost of the entire kit with shipping was $89.00 which is expensive in my book, but it will last me a lifetime! They provide a stainless dissection pick in the kit to use as the tap or drill bit dissolves. If you see gas bubbles in the solution, the tool steel is still dissolving. Since the broken screws I have in this windshield frame are NOT high carbon tool steel, the solution won't work on them so I have to resort to the old fashioned method of PB Blaster, heat, drilling and cursing!!

  Ron Lane,  Meridian, ID