OTC D-10 "screwdriver" - What's it for?

[amecks]

I picked this up today for way less than a buck. It is a screwdriver of a sort. Like its meant to turn a screw that fits over a shaft. As you can see the screwdriver shaft is hollow. Marked OTC D-10, outside diameter about 3/8".
Can anyone tell me what it fits, and on what vehicle it is used?
Thanks
Al

 

[Bighead38]

Wonder if it was a type of security bit?

 

[Neggy]

adjust a carb?

 

[Ricky Joe]

Carburetors use a similar tool, but I am unaware OTC made carburetor tools.

 

[Tostal]

Looks like a driver for 'Bezel Nuts'.
Bezel nuts are the internally threaded rings that hold e.g. car radios or switches into dashboards on older cars.
These bezel nuts don't have a hexagon , instead they have 2 small grooves in the outer face, which are used to turn them.

T~

 

[Stuart in MN]

Looks like a driver for 'Bezel Nuts'.

That's my guess as well.

 

[d42jeep]

Looks like a driver for 'Bezel Nuts'.
Bezel nuts are the internally threaded rings that hold e.g. car radios or switches into dashboards on older cars.
These bezel nuts don't have a hexagon , instead they have 2 small grooves which are used to turn them.

T~

I agree.
-Don

 

[Oldtuleguy]

If you google slotted nut driver a variety of applications come up.

 

[Mintgrun]

It would work well on these. This is the back of my car's instrument cluster... with an added ground strap/wire attachment.
I modified a screwdriver tip, since I did not have the proper tool.



Tom

 

[4xdog]

Seems kind of small for the bezel nuts I'm used on on my vintage Triumphs, and the profile seems a little more pronounced. But there are lots of bezels, and that would be my guess too.

Here's the kind used for Lucas dashboard lights on vintage British cars -- 3/4" and 1" diameters. TBH, the nubs on these are smaller than many of us would like.

 

[RTM]

Delco Distributor wrench, (nut driver.)

OTC Special Tools and Hydraulic Maintenance Equipment for Cars, Trucks, Tractors : Catalog No. A-9 : Owatonna Tool Co. : Free Download, Borrow, and Streaming : Internet Archive

36 p., illus., 27.7 cm, trade catalog

archive.org

 

[unslow1]

So for adjusting the dwell on an old window style Delco distributor.

 

[Firebrick43]

Some guns use the same style of nuts, the cylinder rod retainer on single action revolvers made by ruger. Also 36 to 41 flush nut m1 garands and post lock bar sights like the T105 on the m1/m14/m1a did as well. I have seen some double shot guns of greener crossbolt type design(and belgian clones) use them for the pivot bolts and reinforcing/cross bolts in the stock as well. They would predate automobiles.

 

[amecks]

Thanks everyone and especially RTD - perfect! - more than I hoped for.
Al

 

[ttpete]

So for adjusting the dwell on an old window style Delco distributor.

Those used a 1/8" Allen wrench.
The older Delco distributors used a nut like that under the terminal nut. After the wire was disconnected, the nut was loosened to allow the breaker arm to be removed inside. SO had a tool that looked like a screwdriver handle with that type of tool on one end and an 11/32" socket on the other end to remove the outer terminal nut. I still have mine.

 

[bubinga]

So for adjusting the dwell on an old window style Delco distributor.

I thought the old style Delco distributor 8 cylinders distributor took a 1/8 in Allen?

 

[bubinga]

I need to start reading the whole thread before I comment.

 

[unslow1]

I know the points in mine could be adjusted with an allen or a small flat blade.

 

[bubinga]

I know the points in mine could be adjusted with an allen or a small flat blade.

Ok, thanks yeah I know what you mean it was kind of either or I remember now cuz it had a slot also.

 

[JjKk40]

Could be an hvac refrigeration tool to adjust valves. I have an old Bonney socket set with different sockets for that and they look just like this driver.

 

[Tostal]

Delco Distributor wrench, (nut driver.)

OTC Special Tools and Hydraulic Maintenance Equipment for Cars, Trucks, Tractors : Catalog No. A-9 : Owatonna Tool Co. : Free Download, Borrow, and Streaming : Internet Archive

36 p., illus., 27.7 cm, trade catalog

archive.org

Thanks for supplying the correct answer and also for providing this ^^ link, very interesting read.

Tostal.

 

[Oldtuleguy]

I enjoyed the link as well. Interesting to see all the special tools otc provided in 59.

 

[Private Lugnutz]

SO had a tool that looked like a screwdriver handle with that type of tool on one end and an 11/32" socket on the other end to remove the outer terminal nut. I still have mine.

---

 

[RTM]

Me too. That’s how I suspected what this one was. Lugz and I compared notes a while back, and Outlaw found the ad, in the 2020 GS thread.