Hi Tony,
BB is on the money...some will almost fall off ...but equally (remembering some Scotties are nearing 40+ years old) and may not been sharpened in a long while, things tend to get a little tight with surface rust on the reel spindle and the inside surfaces of the sprocket may be hard to get off easily.

But my advice would be to remove the sprocket nut and get some penetrating oil (Penetrene) down the center of the shaft and let it soak in, and, as the sprocket is clagged, use a large screwdriver in behind the sprocket central ferrule to try and get it to move.... wink

Remember, chinese 3 leg gear pullers are cheap, and you will use it time after time as they do come in handy and are the best method of sprocket removal.
Remember to safely store the key from the spindle keyway after sprocket removal. wink
Hoping it comes off easily for you...
cheers

Please do not PM me asking for support. Please post your questions in the appropriate forums, as the replies it may receive may help all members, not just the individual member.
Kindest Regards, Darryl grin