i don't know about the petri,
but this guy
used to work at olympus and works on pen's
when i was going to buy my ft, i spoke with him
and he was very helpful.
he is located in new york ...
8 oz. water • 4 slightly rounded tsp coffee • 2 tsp. washing soda • 1000 mg Vitamin C
DONATIONS FROM THINGS SOLD, SEE MY BLOG FOR DETAILS
( both are active links )