We use the 7/8″ aluminum Hegar driver hubs with our 100 cc Parilla reed jet engines. We have had many crack at the junction of the shaft and the flange at the back of the hub. We are going to have steel hubs made to eliminate this problem.
We are going to order by 8-15-16. If we can get orders for 10 hubs, the price will be approximately $60 each. If we order more, the price drops accordingly. They will be ready about 3 weeks after the order is placed with the manufacturer. If you want to order or have questions, please reply to this post. If you want to have a longer discussion, PM me and I can give you my cell phone number. Thanks.