Was the extension a factory mount or something aftermarket? My Carefree awning has a factory remote extension like you are referencing. But without a manufactured channel in the arm itself that supports the cable the extension would be useless. The link is the replacement extension which is flexible and folded over for the picture. But again it needs some kind of supporting channel for the somewhat flexible plastic "cable".
Amazon
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2001 Suburban 4x4. 6.0L, 4.10 3/4 ton **** 2005 Jayco Jay Flight 27BH **** 1986 Coleman Columbia Popup