The torque applied by the supply reel motor to keep the tape from freely spilling off the supply reel, and to maintain good tape-to-head contact.
"I sent in a priceless recording of my deceased Father-in-law recorded on his ship in WWII. He was receiving a Bronze Star Medal for his heroic efforts on board. The old 78 recording had so much static you could not make out much of what was said. My husband will receive this BEAUTIFULLY restored recording as a surprise for his 1st Father's ..."
