The best replacement for spool is locker.

The best alternatives to spool are rated as following:
★★★★★  locker
★★★★  posi
★★★★  mini spool
★★★  poppet
★★★  print directly to printer
★★  reel
★★  print directly
★  detroit locker
★  full spool
★  diff
★  multiplier
★  hank
★  bobbin
★  direct to printer
★  welded diff
★  one way
  cylinder spool
  multiplier reel
  utl_file oracle
  spool
  weld
  k04 spool
  poppit

Your alternative for spool is not listed? Suggest!
Speaking about spool, one probably shouldn't forget about weed eater.

Other search terms related to spool and their ratings are:
★★★★★ weed eater
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Google Trends

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spool
locker
posi