The letter kuf is formed from a chof that is slightly thinned out on its right side. The leg of the kuf looks like an “ende” nun, with a slightly thinner head. Its bottom is also slightly shorter and is gradually tapered to a point. If it was formed like a vav or even like an ordinary line (without a head), it is also kosher. The leg may not be connected to the body of the letter. Care should be taken not to put too much distance between them, however, so as not to distort the letter.
משנת סופרים אות ק' וביה"ל ד"ה וירכה ביאורים ומוספים 3-6