Thank you! I spin ultrafine lace weight yarn. This means that within a few bobbins, a tiny groove started to appear. My daughter has a friend at uni who owns a 3-D printer. I texted her a link to the website and two days later, that friend had printed me 16 orifice hole inserts. That should keep me going for quite a while. For those who don’t have access to a 3-D printer or a friend with a 3-D printer: I found that the next best thing is… UV builder gel for nails. Especially the kind that self-levels. Apply with a toothpick, wait for a few seconds to level out. If need be, hold the flyer in such a way to allow gravity to let the gel smooth out in the right direction. Harden with a UV light for as long as the instructions of the gel prescribe. Remove sticky residue with a bit of alcohol on a cotton swab. You won’t have rough edges and any bumps you want to remove are easily dealt with using extra fine grit sandpaper wrapped around a chopstick. There are trial size UV gel kits with lamps available really cheap online and one bottle or pot should last you a really long time if you're not into nail art. Incidentally, builder gel is very useful for a slew of tiny repairs around the house. So is polygel, its more 'sculptable' cousin. I wouldn't recomlend polygel for orifice hole repairs (too fiddly) but your mileage may vary.

Thank you for coming up with an easy solution to the wear issue.

Nice one Maurice

Thank you so much!

Would you be able to let us know what the units are for these inserts, so that people will be able to order these metal parts?