i thought about just starting another clock by using the base ticks but i cant cos

EL0 is the master clock elasped clock , which counts up or down and when started is not stoped untill reset
EL1 is copy of EL0 - used to display the time and has enable /disable to stop the count on EL1 on display , then enable EL1 copies the current values from the master clock to EL1
EL2 is the overtime clock based on the values of EL1 - set event times

this why i really need to correct the errors in EL2 values by using EL1 - set times as far as i can see