3M 65489, Pro Grade Precision Ultra Durable Universal Hole Sanding Disc, DUH5120TRI-10T, 5 IN x UH, 120, 7100202877, 10 per pack 
Insize ISF-S300-U, DIGITAL SPRING TESTERS, 67lbf, 6940561961355
$4,073.97
Resolution .01lbf
Range of digital scale 3.7″
Resolution of digital scale .0005″
Disk diameter 1.9″ DIA
Measuring range of force 5%~100% (maximum load)
Peak hold and automatic release function
Set upper and lower limits, red and green indicator and buzzer alarm
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Insize ISF-S100-U, DIGITAL SPRING TESTERS, 22lbf, 6940561961331
$4,073.00
Interchangeable Spares
S/A Rear Wire Guide Spring (Includes 981705067000 & 981705068000), 981705260000