Catchweght or Catchweight: How To spell?

The word Catchweght is misspelled against Catchweight, an adverb meaning "Without any additional weight; without being handicapped; as, to ride catchweight."

Word contains consecutive vowels 'EI' in between alphabets catchw & ght is misspelled as 'E' as letter 'I' is phonetically igno
Wrong Spelling:  catchw-e-ght 
Correct Spelling:  catchw-ei-ght 
Explore spell check of Catchweight to spell without errors.