Hi guys, appealing to all darkroom gurus out there.

My school has a consumer level enlarger(above model) and is able to enlarge colour negatives. But the thing is the dials on the enlarger which controls the colour casts are all messed(calibration all gone!) now we r printing colour photos using trial and error without any fixed colour settings. any idea how to calibrate the enlarger back to the standard zero position?

Please help me here.