[Slazmo]

The problem I see with mechanical spoolers is that they don't account for the line lay the reel will relay the line back onto the spool with the shims that are on the spool support - either Shimano or Daiwa.

Getting back to basics how I put line on my reels is the reversed method.

Main line onto spool tightly, when appropriate amount on then attach backing line with double uni knot and fill to spool lip / rim or just under and cut backing line.

Attach end of backing somewhere accessable, dump line onto inside carpeted / outside grass area.

Attach end of backing to spool via spool knot and wind on backing and main line through damp cotton cloth or similar with tension.

Can't get anymore precise than that and has a perfect length and taper every time. To adjust forward or backward taper add or subtract another shim to spool support.