Firstly, thanks to everyone who responded, much obliged!
Mr. Bolens 1000, you have made my day! And that's saying something given that I was in the dentist chair today at 10:00am and dropped $1350 bucks on auto repairs later this afternoon!
After seeing your post this morning, I searched on the net using your description and came across a brochure on eBay that confirmed your ID - it looks like mine might be a late 50's Mustang Junior. I did come across the the black and white picture of the tiller you posted early on in my search which lead me to believe mine may be a Bolens as well but there are subtle differences in the tiller main casting and the handle bars; my handle bars are one piece and have a knob on the end of the tine engagement rod.
Unfortunately, my tiller needs a worm gear - it has more teeth issues than I do at the moment. Not the actual worm itself but its bronze counter part; the gear on the tiller shaft. There is a fella on eBay selling a similar gear on eBay right now but it was intended for the Super Mustang. Amazingly, like Rod Serling amazingly, he lives in my home town and I was able to drive 10 minutes and set my gear right on top of his. My gear is about 200 thou smaller than his and there are subtle differences in the teeth geometry so I was not confident that it would work, although my gear is so destroyed that maybe the diameter difference may be due to this. He was not the machinist reproducing the gear but was selling them on eBay for his friend. He did say that this particular gear was used on several different Bolens tillers - see the link below if you are interested.
Anyway, Mr Bolens 1000, if you have any part number information on the worm gear or anything else for that matter, I would really appreciate anything you could share.
Once again, thank you all - the journey has been a fun ride so far and I will add that throughout my research, I was AMAZED about how many companies made tillers back in the day and really enjoyed looking at all the different designs, ads and brochures. I think I'm becoming a tiller geek!