Quick Tilt Tandem Coil Spring Constant Force Balance. This Old balance uses a small T- head pivot bar.
The Quick Tilt Balance is sold only as complete assembly.
They are HANDED from the factory, but can be easily changed as needed.
OLD style are Discontinued, when replacing with new style, will need to change pivot bar, old style had a T-Head, new style uses round head. pivot bar

Number of Coil Springs: 2 - Tandem Coil
Weight: 10-20 (Number stamped on cover)
Number on Coil: None
Carrier Width: 1-1/4 inch (1-17/64 actual)
Carrier Thickness: .540 inch (35/64)*

Replace with Quilt Tilt Constant Force Balance: 534309 Tandem
Sold as Complete Unit, no individual parts available

Related Hardware - New Style
534308 - Single Quick Tilt Balance
534309 - Tandem Quick Tilt Balance
534310 - Triple Quick Tilt Balance

Related Pivot Bars - New Style
532105 - 2.9 inch, first hole 1.364
532074 - 2.5 inch, first hole 1.147
532073 - 2.31 inch, L-Shape

NOTE:
532104 & 532105 have same screw hole Measurements 532104 uses # 6 Screw & 532105 uses # 8 Screw