Rollei 6003/8 shutter 2ms propagation time

Can anyone tell me the particulars of the internal modifications necessary to have a shutter propagation time of only 2ms?

Aloha, took a while to find my 6008i manual. It says you can get the 2 ms with only the PQS lenses, by pressing and holding the memo and then pressing the mirror lockup. This locks the meter reading (if in Auto) and locks up the mirror, and the camera is ready to be fired. If you then press the stop-down button while the meter reads 'QR' then the display will change to _QR, which means it holds in that fast release mode, rather than resetting back to normal. I've used this method and its very quick, I needed to do it for jumping bikini models, yeah, I know really tough.