There were a couple threads about this so I thought I would post mine. Here is it on my 86:
I just took some old hay rake tines which had a hook on one end and welded them to a piece of angle iron. As you can see the welds aren't great, but as I recall the spring steel wanted to melt through pretty quickly when the temp was set right for the angle iron. I'll call them good though as they are all still attached.
I use it in the gravel (but I need to weave a piece of flat bar through the tines to keep them from springing) and in the yard prior to over seeding. I thought the tines would eventually break off but I've been using it hard for 6 or 7 years now and so far none have.
The only thing I did wrong was to weld it too fast and it has a decent bend in it down the length of the bar. That's evening out over time though as the middle tines wear down (slowly).
I originally built it as a pull behind and just put the sleeve hitch adapter on it this morning. I may at some point put in a provision for angling it as well.
It's very heavy duty and can take a lot of weight. Sometimes I stand on it (190 pounds) while my son drives. It really digs in then.
These tines are not hard to find and make a great rake.