I don't know if the Junior Gold Tournament has any specific rules.
Best bet would have been to check with the tournament director. (erring on the side of caution I'd say you couldn't)
But If they are referring to patting the bag on the thumb or finger holes. If it's like the USBC Nationals, You can't pat rosin (or a dry bag) on the thumb or finger holes.
Because the powder gets on the surface of the ball and it can't be entirely removed and your not allowed to have a foreign substance on the surface of the ball and Rosin and Powder are considered foreign substances.
Now if they mean rubbing some in the hole directly before hand , I don't think there's anything against it. Unless they did it in such a way that the powder poured out of the hole or was getting on the surface of the ball.
(Personally I wouldn't want to do that, it would get the hole all gummy and could cause problems with sticking in the hole.)
I think you'd have to know exactly what they meant by modify a thumb hole with a rosin bag.
The pro shop wouldn't really have any bearing on this, that would be something the player would be doing themselves. You wouldn't need a proshop to put rosin in a hole (need one to buy some rosin from though lol).
Note:
There are two different type "Rosin Bags" and are for two different things.
1-Is the Dry/puffball Type bag, those are the big ones you see bowler's using most of the time to dry a sweaty hand or patting on the finger holes. These are a cloth bag and mostly contain a clay like ADsorbent silica material (like cat litter) that makes a fine dust that drys your hand out.
2-Is the Grip type which is more of a true "rosin bag", they are meant to give you more grip. They have a white sticky powder substance in them ( I believe a plant extract or similar type material) that gives you a surer grip on the ball.
Warning these two bags are not interchangeable! Over use the grip type and you can hang up in a ball, also the sticky white powder can build up in the holes and cause you to stick.
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