An anti-pinch chainsaw bar assembly for enabling the extraction of chainsaw bars when bound or pinched during cutting includes rolling bearing members integrated into outer surfaces of the bar. The wearable transceiver devices sense a crash or a fall and notify a monitor by a landline-based phone or a cell phone of this incident and the assisted GPS determined location of the incident. The invention also relates to a manufacturing method of such an optical assembly. The techniques of this disclosure may be used to improve the performance of GPU-assisted memory transfer operations.