I'm afraid I don't know too much about BLH's business outside of railroading, but I don't think you're going to find a dealer for them anywhere. BLH was liquidated in 1970, and almost nothing of the company remains. I don't know of anybody who is making spare parts for their industrial equipment, but then I don't know much about industrial equipment either. Your best bet might be looking for salvaged parts in scrapyards. Other than that, I don't know what to tell ya.
Mechanical Vollenteer - Arizona Railway Museum