Master Craftsman and qualified engineer, Alex Askaroff grew up in the sewing trade and has spent a lifetime repairing all types of sewing machines, from the largest industrials to tiny toys. In short easy to follow instructions, with minimal wasteful diagrams, Alex walks you through the enigma of sewing machine tension adjustment. Alex's specialist insight into this minefield has already saved countless thousands unnecessary repair bills. This no frills 20 page booklet may be the best $5.99 you will ever spend.