vehicle : "rim" "mount" и "arm" auto.

[Cumparsitta]

Коллеги, помогите, пожалуйста перевести данное предложение

After puling the cover off the spare tire it was noticed that the rim was not securely attached to the mount on the arm located at the back of the back door

не могу понять. что за "rim" "mount" и "arm".... слова отдельно перевела, но собрать в кучу не получается .... увы, но ничегошеньки не знаю о машинах (((

Вот весь абзац-
.... After pulling safely to the side of the road several people worked to safely change the flat tire with the spare tire mounted on the back door of the Prado. After puling the cover off the spare tire it was noticed that the rim was not securely attached to the mount on the arm located at the back of the back door. There were six postions in the tire mount to secure the rim through six bolt holes. However the spare tire mount had only one real threaded bolt and a small fraction of another which ran out of threads in less than two turns of the nut.

Спасибо всем кто откликнется

[Yegor]

Consider:
Когда с запасного колеса сняли кожух, то оказалось, что обод запаски не был как следует притянут к креплению на кронштейне, навешенном на заднюю дверь.

[Cumparsitta]

Yegor

огромное спасибо! Вы меня выручили!