No CTD30 listed on Partfinder. CTD00, CTD40, CTD80/5 only. TDC30 models are a bit older than 15 months. I think there is a modified ( thicker ) rear seal for these. Also think it advises fitting a couple of washers between drum and back of cabinet. The cabinet is easily pushed out of shape, you can sometimes squeeze it back square to stop this fault as well.
CTD Condensor dryers and VTD dryers there is a modified drum which we have been fitting for a few months now cures all the scraping problems, they have been fitted to all dryers since june this year.