Before you do a custom fabrication ... call martec up ... it is a family run business and you may get the wife on the phone. I am betting they will give you either a new hub or one of their used, but good, hubs at no charge ... just tell them you have been living with vibrations and didn't realize their hub was the problem ... that has lead to a weak strut joint problem.

one of the props I sent in for refurb had slight fractures in the blades ... so the hub was good, but the blades were not. I got that back but unfortunately gave that old prop to someone who was going to polish it up for a wall ornament.