Are spools harder to lock the line in place than the reels?
Not really.
Looking at the broader picture, when you shoot a SMB the hardest part is fishing it out of the pocket and actually launching it without:
- putting line all over the place (cutting tool mandatory if you carry any kind of line!)
- changing depth too much
- getting out of trim if that's your thing
If you can manager the above, the actual winding/unwinding and locking the line in place are non events.
As for spool choices, I like my bright orange line especially when visibility isn't good, and stainless steel bolts last a lot longer than brass. If you dive with thick gloves, there are spools designed for that, which I haven't tried yet but will if I get an occasion. That said, even with dry gloves the regular spools work just fine.
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