What Is This Tool Called?

[Lemo]

Google is failing me. I'm looking for a little lever that fits on a dial indicator so I can center up an internal diameter in a 4 jaw chuck. What am I looking for?

 

[Tony Wells]

Some call it simply a hole attachment.

 

[Lemo]

That's it! Thanks.

 

[yooper]

Starrett 670B AGD Indicator Hole Attachment, 1.6875" Hole Depth, 0.375" Stem, Here is another style, this one fits the stem of the indicator. The one shown above is for a back plunger style, like a starret 196 indicator. I think mrpete222 had a video on this one. Hope this helps.

 

[TC0853]

Wow! That's a great pic. I bought an old set in the box 3 or 4 years ago on eBay, primarily for the 196 indicator to use on a jig I was making for trueing my tailstock, and I kinda figured that little setup was for an internal bore, but I wasn't quite sure how to set it up in real life. Now I know! No doubt you could rearrange things so as to hang it out of your milling machine spindle and indicate a bore, but it seems like using a coaxial indicator, or for that matter a dti on an axial holder would be just as fast, or faster, and just as accurate.