Expensive? I checked the price on the link given and found the price was £25, possibly plus VAT. I know the component, since I have a DW110, and I wouldn't make it at that price for a commercial customer and would think twice about making it for myself. The problem is that all setup time has to go into one item; given the right equipment, which I don't have or want, one setup could make hundreds, but where's the market? The original was also cast and only machined where it mattered, a one-off will be made from solid, involving a lot more material removal and thus time. I regularly advise customers to buy spares if they can rather than have them custom-made or repaired. If there are no spares then there's no choice, but don't expect one-offs to be cheap.