Martin, you may possibly have torn a small rotary cuff ligament in the affected shoulder, i have had it ,it does happen with continuous use ,and this means years and years of lifting pulling and generally hard work ,it just happens ,klik and you have it ,,,my answer was physio ,also one of my son,s is a profesional sports science guy and he set me up with exercises ,what had to stop was ,,i sold the Imara and a few other heavy boats are laid up ,,Martin this is only a friendly help ,i could be wrong ,,but your symptons sound like same ,,,,i hope you get some relief it is nasty ,and the pain kiillers helped ,in their way ,,