If anyone has one of these sliders and is willing to send me some detailed measurements and good pics from all angles, I will draw up a model and print one in ABS or Nylon (ABS is less expensive but nylon is more flexible) and send it out to someone for testing.  I have no idea how durable it will be but it is worth a shot because it will be MUCH less expensive to print one than it will be to have it CNC milled. 

I PM'd Cworobec about this.  He is interested as well but it seems he is away from home a lot.