I recently purchased a new Spider Pen Pro on eBay (yes, I know, generally not a good idea but options are limited in Australia!) however I found that the motor made quite a loud high pitched whine noise when it was running (could be heard from metres away) whenever there was tension on the thread (such as pulling the thread out or simply having the thread attached to a surface). If the thread broke or the thread spool was not in place, the motor was silent and did not make the noise (I was able to test without having the spool in place as the motor turns on for a few seconds when inserting the battery, so I did so without the spool and the whine did not occur). I tried multiple branded batteries in-case the issue was caused by an under-powered battery causing the motor to become weaker when it had a load on it, however this did not resolve the issue. I contacted the seller and they said the motor should always be silent and that it may have been damaged during post, so they sent a new one which has the exact same issue! Does anyone have any idea on why this is happening?