I still have some place the special lever for extracting the split ring, anyway yes place the full ring on first then lay the split ring on, you should be able to press one side of the tyre low enough to enter the first bit of the split ring, once that is located, can be tricky, keep your foot on it and follow the rest round with a sledge hammer, please ensure it is all correctly seated prior to inflating, strictly speaking it should be done in a strong cage designed for the purpose, if the ring comes off during inflation it has enormous power, many guys were very seriously injured when those wheels were popular, Rick