Filling up a new reel with line and the diameters aren't lining up

KastKing Radius KutR™ Line Spooler – Built-in Line Cutter - Compact Fishing Line Spooling Tool for Spinning Reels and Casting Reels – Quickly Spools Fishing Reels Without Line Twist

Penn Spinfisher VI 2500, 3500, 4500 reviews and reports so far - £119.99 to £129.98 UK prices — Henry Gilbey

KastKing Radius KutR™ Line Spooler – Built-in Line Cutter - Compact Fishing Line Spooling Tool for Spinning Reels and Casting Reels – Quickly Spools Fishing Reels Without Line Twist

Line Winding Tip: Smart Use of Backing on a…

Does the line level on your spinning reel really affect how far you can put a lure out? — Henry Gilbey