After more than a decade of fairly heavy use, the focuser on my 16" astrosystems structure began to fail and is in need of repair. I contacted Randy at astrosystems inquiring about the cost for an overhaul and much to my delight, he responded promptly that my focuser is covered by a lifetime warranty so the repairs will be done at no-charge. Astrosystems in an American company with solid service and parts. Keep 'em in mind:
https://www.astrosystems.biz/
https://www.astrosystems.biz/