I own a 336 hunter with furlex furling, Need to replace the line. Have a picture of unit but it is not clear on disassembly. It looks like the two halfs of the spool may snap together, Also there is plastic ( Rivot ) ? in one of the two holes in the base of the spool. Do they need to be drilled out before the two halves can be unsnapped ? this is a type two class B furlex -------- j ----------------