I live in Colorado and looked at all the old dealers and the big dealerships. Noone had someone that knew how to do it. We took our trailer to Joel Werner in Ohio and he did an excellent job. He can be reached by going to hiloparts@gmail.com
There used to be a Hi-Lo dealer called Stahmann Sales Co.,
2021 FM78, Seguin, TX 78155
They used to service the trailers and may have someone that remembers how to do it.