פירוש על עבודה זרה 103:17

The Talmud finally arrives at what the question really is. R. Yishmael holds that an idol made by an Israelite is prohibited immediately. So if we derive the rule regarding this accessory from the idol itself, it too should be prohibited immediately. Alternatively, we might say that it is like accessories to idols owned by non-Jews. Just as those accessories are prohibited only once they are used, so too this accessory is prohibited only once it is used.