Well lucky were not talking about motorcycles,
if you choose a bad company greenie then that's bad luck, they exist in every country, but like I said there is a good reason why the toolmaking in this country and yours is being sourced out to the east, (Hungary and others too) you can get get the same quality for less than half the price which is the reason major company's in this country like Flymo, hoselock etc swapped their tooling manufacture to there. (and the reason why our manufacturing industry is dead as you cant compete)
If I were producing glides in bulk I'd certainly look into it, but like you say quality control is key so best not experiment when you have people waiting for orders or buy unseen stock, I would of let them machine and supply, if there wrong you dont pay.
The glide i had done here was my design, i used ProE, using delcam for the machining, hence I just paid for machine time.