Here's the ER-301 from @kansha with capacitor torn off. I had to get help to fix the unit myself.

https://www.dropbox.com/s/4na8o465m41d3k5/torn%20capacitor%201%20when%20received.JPG?dl=0

Module was wrapped firmly in bubble wrapping by the seller who does not assume liability for any potential malhandling while packaging himself. A year has passed since he said he would initiate a compensation request from the the post office. Meanwhile I have requested a little less than a 10% discount (I paid £908,40). He does not approve of this.