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You can do it with a normal crank puller if you have a suitably-sized length of rigid material to push down the middle of the spindle for the crank puller to press against. I've got a bit of 1/2" mild steel I use. Still relatively easily lost. I think I've turned the last one into some components for tools for making bits of my frame jig.
Brommers-
The new spindle arrived Friday so I got impatient and did this.
Used an appropriately-sized socket backwards to get as much contact possible with the end of the opposing crank bolt, then used my 3/8ths extension as the suitably-sized length.
Installed both arms on the new spindle to measure up for spacers and clearance, then realised I'd need a longer suitably-sized length to get them back off... 160mm spindle.
Emyr
What's the best technique for removing an NDS Hollowgram crank from the spindle without spending over £20 on Cannondale KT013 (which consists of two small easily lost chunks of metal)?
I know using something to sit against the end of the spindle is a bad idea because the crank threads are already shorter than most other cranks.