Good comment on the sack the skeins to slow the milking. Here's one, to harden off eggs and skeins soak them in the native cold waters for about 15 min as nature would do as moma would drop her eggs, get fertilized then harded off it's all done natural take them home to be soaked in cure A.I. TonyAnother thought to spawn sacks.
If you've made the mistake of freezing your skeins before they are cured, you'll end up with eggs that milk out very quickly and fall apart. Those "bad eggs" can be saved by putting them up in spawn sacks. They will milk out slower so you can get a few casts out of them.