Loose knob on Marshall Major IV

I have a query regarding my Major IV knob button – it's become a bit loose, making it challenging to turn the volume up/down or switch to the next/previous song. Has anyone experienced a similar issue or knows a reliable way to repair it?

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0