It's just a regular wilwood master with a plastic screw on lid. I never had to push it down but as long as you didn't push down hard enough to break things you could try it. This is a picture of it on the BDR website.
Backdraft Parts - 3/4 Clutch Master Cylinder - Clutch Engagement - Transmission - Products
I ruined a T5 due the clutch not engaging properly. Good luck.