Dropped a whole tin of pins on the floor. My friend bought me a pin pebble for Christmas. A palm sized magnet in a plastic casing to pick up pins or keep them on the table. Genius!
(9 times out of 10)
You cut the threads on the reel side and remove the spools as above.
Put on the new colour and tie a small knot to join the threads. Then slowly chain off a new piece. The first two reels go through easily but you sometimes lose the last two if the knot can't quite get through the eye of the needle(s). It sometimes works but if you have to put the ends through the needle that is no great job, at least you don't have to open up the front and get it all wrong inside.
Today Big sis had her first go on the overlocker. She was frightened, it was perilous, I am not going to lie, however she soon got the hang of it. I'll show you what she made next week when it is finished.
Enjoy sewing or making whatever makes you happy.