I am going through my old but usually reliable old Husquvarna 40 chainsaw and think I have isolated the problem to the carb. Does anyone know where I can find a replacement? Google has not found anything, not even a substitute. I would purchase just a carb kit but that doesn’t come up in any search either. The saw is about 1984 vintage, at least that’s the date on the manual and parts diagram that I have. I have other saws to use but like to grab this one for small quick work. Thanks for any help!