Dustcap pressed in :/

Hi guys, so far my Focals had been installed without a protective cap *AsheaufmeinHaupt* (had only blind plugs, there’s nothing going on). This morning, a stupid friend of mine entered the Dustcap of one of the Focals (just pressed in, no hole or so), how can I fix it now? Are there possibilities or do I have to replace a single TMT now?