SEIKO 8B Original Sewing Machine Thread Tension Assembly Complete FOR SEWING MACHINE|assembly|assembly machine - AliExpress
Golden Eagle 229 45356 Thread Tension With O Ring For Lockstitch Sewing Parts sewing machine parts thread tension|Sewing Tools & Accessory| - AliExpress
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Amazon.com: ID: PFW-66774, 125314. 2 New Generic Replacement Sewing Machine Upper Thread Tension Springs, Compatible with, not Manufactured by Singer. Will fit Models: 201 221 222 301 401, Plus Others as Below
Dealing with common thread tension issues - The Sewing Directory