I have a 1989 18 ft. wellcraft with the rubber type rub rail and the rope insert, just wondering how big of a job it is to replace.The line looks like it can be pulled out, however the rubber holder feels very stiff with little give.How would you push or bang the line in, is it just muscling it in, or are there any tricks of the trade.Also short from the proper size is there a special line that goes in?Thankyou Andy