Replace / Install a Missing Tension Unit on a Singer Model 401A

My 401A machine, "Trouble", did not have a tension unit when I bought it. I've gathered up spare parts and this video shows how to install and "zero out" the needle thread tension unit. Includes rust removal and cleaning and oiling of the tension unit when needed. A good tutorial to increase your knowledge of SInger tension units, their maintenance, installation, and adjusting. Singer models 401A, 403A, 404. ALL ABOUT TENSION PLAYLIST: https://www.youtube.com/playlist?list=PLsCOZgzzaiKJaeFB_GW97NsW5GYM7KD9U The BOBBIN TENSION METER I use in the video can be found here: https://singer-featherweight.com/collections/parts/tension and at other online sellers. KRUD KUTTER CLEANER/DEGREASER: https://www.rustoleum.com/product-catalog/consumer-brands/krud-kutter/cleaners-and-stain-removers/original-krud-kutter MAGNITIZER: https://www.homedepot.com/p/Husky-Precision-Magnetizer-and-Demagnetizer-3601H/302880580 MUSIC: SUMMER NIGHTS by the126ers 00:00 INTRO 00:50 TENSION PARTS 02:52 RUST REMOVER 05:29 TAKEUP SPRING 06:00 TENSION PLAYLIST INFO 06:45 NEW SPRING? 10:32 WASHING PARTS 14:25 PARTS OILING 17:30 OIL HOLES FOR PARTS 18:20 INSTL TENSION STUD 21:00 INSTL RELEASING PIN 24:30 INSTL THREAD GUIDES 27:50 INSTL DISCS-SPRING-GUARD 30:33 INSTL INDICATOR 30:50 INSTL BEEHIVE SPRING 31:34 INSTL STOP WASHER 32:05 INSTL TENSION FLANGE 34:18 ZERO OUT 38:08 OPTIONAL METER TEST 41:00 INSTL NUMERATED DIAL 42:50 INSTL KNURLED KNOB 44:16 INSTL CAP & SCREW 46:00 THREAD PULL TEST 47:00 REMV ENTIRE TENSION UNIT 49:55 SET TENSION ON SPRING 50:35 INSTL ENTIRE UNIT