Our house was built in 1978, and we have crank-out Pella casement windows on our home's second story. We can no longer crank open one 30-1/2" x 40-1/2" window because the operator hardware is broken. You can see the broken gear in the posted photo. Is it possible to get replacement hardware for this window? And if so, can we just replace the one broken section? We appreciate your professional advice. Thank you -- Larry