I personally, and knowing what sachs clutches are like as i work for them, wouldnt reccomend them sticking it on the rollers straight after he new clutch has been put in. I was told, via sachs race engineering in Germany that they really need at least 400-500 miles to bed in before you give them any stick at all. I did about 370 on mine before i took it to santa pod for GTI inernational last year and it was fine. But seriously, if they stick it on the rollers, i wouldnt be suprised if it does slip especially as its not bedded in.