I've had my VC large winter warm about 20 years and burn to heat the house, last year the air control lever broke off cause the mechanism linkage was difficult to move, this year the fan control is becoming very stiff. I would like to remove the stove from the masonry and go over the entire stove and bring it back to 100%. the local stove guy that does my chimney cleaning always has a new guy that doesn't know stoves. I am mechanically inclined so I can do it myself with instructions. The questions are this, what is the life expectancy of these stoves? are these linkage mechanisms accessible ? anybody here try this? What is most likely causing this stiffness? Any you tube videos? thanks in advance for any help.