Andrew,
What year was your prop made ?
There is an SB out that covers these problems.
I would suggest you get in touch with Ali Mant at Proptech in Portsmouth - they are MT dealers and he has helped me out with similar.
http://www.proptech.aero/contacts/
PM or email me for further info, I am in Harrogate, Yorkshire.
Not back home until Monday, in Cancun at work.
Mike