Trying to put together a 1990 GSC prop on a 582 B-box. All new but poor instructions with prop. I thought is was a ground adjustable but has a bolt hole in the root. If I don't use the hole it only will have three hub bolts holding the prop on. Also has a plate about 1/4 inch thick that I assume goes on front of prop hub. Not sure at this point if hub bolts will be long enough if I use my spinner cause I haven't put the squeeze on the hub yet. Trying to figure out what I have. GCS phone always seems to be busy. Can anybody shred some light on this assembly order.