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Basically I came into owning three Ironclad dreadnoughts. (one is really an old BA Furioso but anyway) but I need chainfists for them. Thing is I'm not keen on the little saw thing that comes in the kit and so I'd thought instead of that, for a chainfist I'd give them a drill weapon. (Ya know... Giga...drill...break!.... Or Bioshock Big Daddy if you don't watch anime.)

Thing is I'm having a hard time sourcing a bit that would fit them. 3rd party, toys, GW, or whatever, just need three conical drills that'd fit on the arm of a Space Marine Dreadnought. I REALLY thought it'd be an easy find with the 3rd party bits groups out there, but so far I'm coming up blank.

There’s a drill of that type in the Killa Kan kit and I think there’s some on that new Genestealer scenery kit with the big “mole” type drill.

I’ve also seen people use rawl plug / drywall screws, as they can be quite funky looking.

Maybe? Cheepo chinezium at harbor freight or grandpas old coffeecan
TAPERED THREADED MINI MANDREL?
or
Tapered Screw Plugs?
or
Countersink Drill Bits?
or
Chamfer Drilling Bits?
or
Plug cutter bits?
or
Tapered spindle?
or
Tapered spring?
or
Tapered wire brush?
or
GreenStuff (https://gotflag.blogspot.com/2012/11/would-you-kindly-28mm-bioshock_1.html)
(https://www.dakkadakka.com/gallery/351309-WIP%3A%20Granddaddy.html)
or
LEGO? (https://www.flickr.com/photos/kumipallomaa/49614370773/)
or
this (https://www.dakkadakka.com/gallery/276586-Big%20Daddy.html)
or
Killa Can Set Bits
http://blog.bitzbox.co.uk/ork-big-daddy-meganob-conversion/
https://www.bitsandkits.co.uk/ork-killa-kan-drill-bit-p-5769.html

Convert away!

Yeah I'd third the killa kan drills. I put them on some of the kastellan robots and they look great.

Thanks for the help. Course, with my luck sure enough the killa kan drill seems to be sold out everywhere and the tectonic fragdrill is hella expensive, for just getting the small drill out of that kit.

Try googling...

Walldriller Self-Drilling Anchors and Screws - #6

You’ll find 12-packs for about $5 Canadian.