Rakers just supply security when they are supported and footed appropriately; single-tube rakers alone do not usually provide this and need to be supported to prevent fastening. https://5qgug4jignwv5pqpdpc5bzeqqti76l77oh6r7dnmlcrrtxt4piha.cdn.ampproject.org/c/s/www.multichain.com%2Fqa%2Findex.php%3Fqa%3Duser%26qa_1%3Dbladegas5/