That’s what I had in mind. Using this method to do a fast oil change at 25hrs.
not exactly what I read here…
Peter wrote:
this would on the TB20 enable the 50hr to be done without lower cowling removal
Are you on a 25h oil change schedule, how come?
OK; I was being ambiguous 
There is a good reason for going to 25hrs, although I seem to rarely actually do it; the plane does a fair number of hours.
