[MrAC1980]

Won't matter what size you use, no matter of the grooves. I suggest you "back" the spool with the mono lets say about half way, then use a good knot, then top the spool off with the braid. Reason you do this is so the braid will never slip on the spool. No need for the electrical tape in between. And another tip is unless you dunk the reel/spool a lot in saltwater... You can "flip" the braid on the spool and get a double use out of it. Every other year I take my reel with braid and reel it onto another reel, then onto another reel, and then back onto the original reel, this in turn will give you the fresh braid from the spool back to the top of the reel. Make sense? Hope this helps.