I picked up a pair of BIC America Venturi V-52 and one of them is missin the black port tube. My handy-dandy wooden ruler tells me this thing is 7/8" inner diameter by 1 1/2" length. At the moment I'm more interested in just making it cosmetically appealing again, so it's possible this wouldn't have to be to this exact specification, provided it just fits! I'm not familiar with exactly what function the port tube serves anyway, so maybe I do need it exact. I just don't want to router the hole! So any options to bring these back to good condition?