Hello,
A bottle of oil that I just bought for my 99k was faulty. The nib was solid plastic too far down, so that the hole was much too wide when I cut it. I’ve already lost a third of the oil, when I knocked the bottle over, so I’m giving up on it. It was from a quality Singer shop, so I expect this is just bad luck. I’m wondering about those oil pens. Gunold or Prym. Are they as good or better for oiling an 99k machine? I’m hoping they won’t have this faulty nib problem at least.