DEAR HARRY: I am unable to get an amortization schedule from my mortgage lender, who bought the mortgage several years ago. The original lender told me the same thing. I cannot understand why. My mortgage payment is a little different than usual. Instead of a uniform monthly payment for its lifetime, I pay a fixed amount of principal each month together with interest on the unpaid balance of the mortgage for that month. I cannot see why this should create an insurmountable problem for them. There must be some nonsuper mathematician who can figure out how to get one for me. Any ideas?