Mark Lancaster
I agree with the point that chassis replacement is the only way to go.
There is nothing wrong with the SE Finecast chassis but I would like to also suggest that a call to PDK may also prove fruitful. They do not list the T9 chassis as seperately available but polite requests are dealt with sympathetically by very pleasant staff.
The PDK chassis is designed to be bult in EM gauge as well as OO and is designed with beam compensation.