Hemer or Hemmer: How To spell?

The word Hemer is misspelled against Hemmer, a noun meaning "A tool for turning over the edge of sheet metal to make a hem."

Hemmer has double "mm" is mispronounced as "m"
Remember double 'MM' in between the strings he & er which should not be misspelled with single 'M'
Wrong Spelling:  he-m-er 
Correct Spelling:  he-mm-er 
Explore spell check of Hemmer to spell without errors.

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