I'd not suggest using an electric finger on one of the "spun" Froom spinners, or most of the plastic spinners, but I'm sure some do it.
I've only used one Veco spinner...it was 100% die cast, and would be zero problem. I would add that there are various shapes of drive cones, at least for Sullivan starters, and IMO, a needle nose spinner should provide a better "grip" than a more blunt spinner. I'm pretty sure Howard likely has a graph detailing that principle, but it's just my gut feeling.  Steve

   Sullivan makes a super soft and grippy cone that is what I use in my electric fingers. There is a Veco spinner on the Fierce Arrow I have that belonged to Mike Gretz, and I have used it on that model with no problems. I normally hand start everything, but some times you just gotta grind it. Just be gentle and use short bursts on it. If it's gonna start at all, it should do it with short bursts of the starter.
  Type at you later,
   Dan McEntee

    Sounds like you were looking for a flat back plate plastic spinner? The only ones like that I know of were the SIG plastic spinners. SIG is closing them out but I think they are out of 2" diameter units.
  Type at you later,
  Dan McEntee

Thanks Brett.   How are they different than my antique VECO spinner?  I had one of them on my 1/4 scale CAP 232 with a G62.  The only difference is the spinner has an allen bolt to hold it on instead of a aluminum bolt and threaded nose piece.   

The application would be the same; that the spinner would rotate until it is stopped by the back edge of the prop.  Am I wrong?

   Unless it is loose, the cone will turn the backplate, which is a very close machined fit. The difference with the Veco is that the cone bears directly on the backplate, rather than the Veco, where the cone fits over the backplate. Push on the Veco, and it wants to push further over the backplate, the only thing stopping it are 6 very narrow ribs. Those 6 small contact patches are the only way tor transfer the torque to the backplate, so when you turn it, they slip, and the cone hits the rear edge of the prop.

    The TruTurn and other modern spinners can't get pushed over the backplate, there's a tenon. RCists use starters with this arrangement all the time, if you put them together, they are hard to turn relative to each other even without the screw, and you can tighten them down pretty good.

   Brett