Only just seen this post. An engineering company called Cliffes at Longroyd Bridge had it's own foundry. They were textile engineers in that if a part of your machine broke, you could take it to them and they would make a wooden pattern, cast a new piece and machine finish it. They were still in business in 2000, but I think they are now defunct. There was also another foundry at the bottom of Birkhouse Lane, just over the canal bridge on the Manchester Road side. That one is long gone - poncy housing now - but they did similar stuff to Cliffes.