actualley I think it's dry rot like a trailer tire.
this area of sling is under alot of preasure the rest of slings look good.
1990 15' Lowe deep V hull 1996 Rude 25 top speed 45knots this 268LB hull w/ trailer is for sale
1977 StarCraft Chieftain 22' rebuild/repower/conv. pilothouse/top speed 53 knots aluimin 14.5"X21 pitch