The spelling of the word "wiemer" can be explained using the International Phonetic Alphabet (IPA). The initial sound is a voiced bilabial fricative, represented as /w/. The following vowel is the long "i" sound, represented as /aɪ/. The second syllable begins with an unstressed schwa, represented as /ə/. The final sound is a voiced alveolar stop, represented as /dʒ/. Therefore, the correct spelling of the word is "wiemaker," which refers to a person who makes saddles and harnesses for horses.