Sorry, I did try this before.
The error after applying your suggestion I get is this
sketch_may08c.cpp: In function 'void setup()':
sketch_may08c:8: error: invalid conversion from 'void ()(void)' to 'void ()()'
sketch_may08c:8: error: initializing argument 2 of 'int8_t Timer::every(long unsigned int, void ()(), int)'
sketch_may08c:17: error: no matching function for call to 'Timer::after(int, void (&)(void*), int)'
/Volumes/OPTI/Arduino/libraries/Timermaster/Timer.h:42: note: candidates are: int8_t Timer::after(long unsigned int, void (*)())