There are two, or possibly even three different lengths of throwout bearing carriers- - - -the round piece that slides on the front bearing retainer of the transmission. The design of the pressure plate spring fingers determines which one is correct. A short bearing carrier where a long one is supposed to be used can cause the problem you're having.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!