On my own Signet oboe I lengthened the bell key barrel so I could fit a low Bb bell vent which meant relocating the lower pillar further down the bell (just above the logo) which in turn meant having to fill in the original pillar hole http://www.clarinetperfection.com/galleryclar/Keywork/CP2/15.jpg.
As this is now located under the key barrel, I filled it in with hard wax, then used a reed to scrape and level it, then using exactly the same method in getting a mirror finish on shoes I polished it by hand buffing with a damp cloth which brought the hard wax up to a bright shine to match the glossy finish of the surrounding plastic.
This is fine if you're not in constant contact with it which will wear out the filler over time, especially if it's only filling shallow imperfections. But if it's in a reasonably inaccessable area, then it's a good and hassle-free cosmetic fix. Similarly with filling in screw holes left in plastic instruments when the thumbrest has been moved, plus it's an easy thing to reinstate the original filled-in holes if the thumbrest has to be put back in its original position later on - the wax can easily be removed by hand with a twist drill.
As this is now located under the key barrel, I filled it in with hard wax, then used a reed to scrape and level it, then using exactly the same method in getting a mirror finish on shoes I polished it by hand buffing with a damp cloth which brought the hard wax up to a bright shine to match the glossy finish of the surrounding plastic.
This is fine if you're not in constant contact with it which will wear out the filler over time, especially if it's only filling shallow imperfections. But if it's in a reasonably inaccessable area, then it's a good and hassle-free cosmetic fix. Similarly with filling in screw holes left in plastic instruments when the thumbrest has been moved, plus it's an easy thing to reinstate the original filled-in holes if the thumbrest has to be put back in its original position later on - the wax can easily be removed by hand with a twist drill.
