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Old shaft thread size
I just picked up a set of Unicorn Dum Dums that I'm guessing are from the early 70s. They have long cane shafts fitted into threaded plastic holders, and feature feather flights, but the feathers are in very bad shape. I'm wondering if anyone knows the thread size of the plastic holder part (which threads into the dart body). I thought they were 2BA, and they're very close to that, but just slightly off. I had expected they'd be 1/4 like my other old brass Unicorns, but they aren't. 

Any ideas about the thread size? When I look at the 1970 Unicorn Book of Darts, it looks like they made 3 sizes: 1/4, 3BA, and a number that I'm not fully sure of but may be 3/16. Thanks in advance for any info anyone can provide.
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Search eBay for 1/4 inch old threads, or old style dart shaft. I got some delivered yesterday.
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(03-07-2020, 10:26 AM)Billy Bonkers Wrote: Search eBay for 1/4 inch old threads, or old style dart shaft. I got some delivered yesterday.

If you read the initial post it said he expected them to be the old 1/4 thread but the aren't
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Ah, so he did. Maybe someone else can use the info...
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Just had a look through some of the other Unicorn books and the number you can't make out is 3/16" and I'm fairly sure that would be the size you need - although where you would find them I don't know.

It's a bit of a long shot, but it may be worth asking Unicorn if they still have some lying around (it is unlikely, but you never know), or they may even have an idea of where you can get some.
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I have bought new 1/4 " shafts and feather flights on eBay from this guy in Canada. He may be willing to re-feather your 3/16" stems.


eBay Seller:
the-dart-guy
39 Elkwood Dr.
Hamilton L9C 2T4
CA
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Thanks for the replies -- I'll try contacting Unicorn, and if that doesn't work, I'll give the-dart-guy a try. The cane part itself just slides into a short sleeve in the 3/16" white plastic threaded part, and those plastic parts are still in decent shape -- so I could also try adapting some regular stems to fit into that sleeve (or 3d print something).

I know that working on old cars is all about finding the parts, but didn't expect the same with old darts! Guests cannot see images in the messages. Please register at the forum by clicking here to see images.
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The shafts for the dum dum’s are 3ba. I was looking for something in the older Unicorn books of darts (don’t remember what it was a while ago) and remembered reading this thread. In the 1970 BOD on page 15 are the dum dum darts. The product codes are listed on the left in bold print and below them are the codes for replacement flights 4SFC is the code. On page 20 the replacement feather flights are shown. By looking at the chart you can see 4SFC is listed in the 3ba column. Hope this helps, I’m sure it’s gonna be quite hard to find some of those old 3ba feather flights. But like you said maybe you can 3D print something that will work now that you know what size the stem thread is.

Darts: Custom Made Darts 20g
Backup Darts: Unicorn T90 20g from mid 80’S
Shafts: Supergrip Carbon medium
Flights: Harrows Marathon Shape

2019 180’s - 21
2020 180’s - 15
The Highest Checkout: 154
Best 501 Leg: 14 Darts
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(03-07-2020, 05:11 PM)pkittle Wrote: Thanks for the replies -- I'll try contacting Unicorn, and if that doesn't work, I'll give the-dart-guy a try. The cane part itself just slides into a short sleeve in the 3/16" white plastic threaded part, and those plastic parts are still in decent shape -- so I could also try adapting some regular stems to fit into that sleeve (or 3d print something).

I know that working on old cars is all about finding the parts, but didn't expect the same with old darts! Guests cannot see images in the messages. Please register at the forum by clicking here to see images.

Garden split cane, might fit the bill and feathers used for archery (on ebay) if you fancied a bit of diy.

As you figured out the important bit is the white plastic part (i recon) the rest can be rebuilt.

https://www.ebay.co.uk/itm/GREEN-SPLIT-C...SwI99flEeK

These might need trimming down to the right diameter, to slot into the white plastic bit.

https://www.ebay.co.uk/itm/GATEWAY-ARCHE...SwBahVGAB9

You will likely have to trim these down as they seem to be 3 inches long, but, that means you can get extra, pieces of feather, from the ones ordered (maybe make a template to cut your own, dimensions, from them) at least they are available.

And maybe a bit of whipping thread

https://www.ebay.co.uk/itm/QUALITY-BLACK...Sw41xXPFls

I think it entirely possible they where built to be rebuildable and approximate dimensions can probably be guessed from the original shafts you have left there, obviously it will require a fair bit of effort (but, might be quite rewarding, in its own way).
Yes its me, I checked in the mirror. 

Current throwing weights of 18 to 24 grams.

Current darts set up :- 23 gram, darts clearance (no name scalloped darts) with a 50 mm barrel, 41 mm nylon shafts + standard flights.
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Thanks, Phil and Jon! Appreciate the leads. Have not done anything with these yet and am glad to have more info.
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