WITH ITS MEASUREMENTS OF THE REFLECTION COMPONENTS FROM ACCRETION DISKS IN BLACK HOLE (BH) BINARIES NUSTAR HAS MADE SIGNIFICANT PROGRESS IN CONSTRAINING BH SPINS. DETERMINING BH SPINS IS IMPORTANT FOR PROBING REGIONS OF STRONG GRAVITY INVESTIGATING CONNECTIONS BETWEEN SPIN AND RELATIVISTIC JETS AND FOR COMPARING THE X-RAY BINARY SPIN DISTRIBUTIONS TO THOSE INFERRED FOR THE BH-BH INSPIRAL EVENTS. TO CONTINUE THIS WORK WE PROPOSE A 50 KS TOO OBSERVATION OF ANY BH TRANSIENT THAT HAS NOT BEEN PREVIOUSLY OBSERVED BY NUSTAR. WE WILL USE SWIFT/XRT MONITORING TO TRIGGER THE NUSTAR OBSERVATION IF A BH TRANSIENT SHOWS EVIDENCE THAT IT IS MAKING A TRANSITION FROM THE HARD STATE TO THE INTERMEDIATE STATE.