Have a friend with a 27ft mk1, who is having a problem with his sail 'slugs' coming out of the track when he drops the main. Is this 'normal' on a mk1, for the slug opening to be more that a couple of in. long? He said if he puts a stop in the track, he'll not be able to lower the main all the way onto the boom. Any of you have a 27' mk1???? Thanks.