Planchete or Planchette: How To spell?
The word Planchete is misspelled against Planchette, a noun meaning "A circumferentor. See Circumferentor."
Planchette has double "tt" is mispronounced as "t"Remember double 'TT' in between the strings planche & e which should not be misspelled with single 'T'
Wrong Spelling:  planche-t-e  Correct Spelling:  planche-tt-e 
Explore spell check of Planchette to spell without errors.