Sitting down to do some piecing this afternoon and all was going smoothly until my thread snapped......muttered away to myself about how I had just been reading this thread earlier. So, I went through all the usual remedies to no avail when after re-threading for the third time after thread breakage I pulled the thread down near the needle and watched it travel from the spool...... and what do ya thinks I saw peoples? I saw my thread coming off the spool so nicely and then, every couple of revolutions of the spool it snagged.....on a tiny bur on my plastic spool cap!! Never thought to check the spool cap for rough edges! Once I rubbed that errant little bit of plastic horror off the cap edge all went smoothly and I had no further trouble. Really, it was so small but it still protruded enough for my finger to feel it and obviously the thread to snag on! I've had this problem on and off for ages, always putting it down to haphazard gremlins but in reality it has always been it would seem, when I have used this particular spool cap and when I have inadvertently placed it on the pin with the burr uppermost where it would snag the thread! Who woulda thunk it eh??
