I'm looking for a converter to turn my 18.8mm bong stem into a 14.5mm. It is 18.8 but I just accidentally ordered a 14.5mm one and I can't cancel it. Stupid, I know. But yeah, I'm looking for a converter kinda on the cheaper side ($10ish), but if I could find one that was also a pre-cooler/ashcatcher, I might be able to spend some more. Help a brother out?