What are you cutting with a 1/8 inch blade that can’t be done by a 3/16th blade? If your 3/16th blade can do the job, why not replace your 1/8 inch blade? A 1/8 inch blade may not be suitable on your 14†band saw - maybe because of the guides? It would be wiser to change the blade than to buy new guides just to fit a 1/8 inch blade on your band saw.