I can show you how to convert a Razor E300 Scooter, I suggest you buy from Amazon.com should be about $250, into your very own Rehab Handicapped scooter. The E300 Scooter you will receive has only one speed. High Speed, or coast, nothing in between. It is made for some one 13 years old or older that weights less than 220#. With my modifications it can go as slow as you need to go, and up to 12mph for a couple of miles. This all depends on your weight. I weight 275# and I can ride my wife's scooter for a couple miles on fairly level ground. If you need to climb up steeper hills you can change some parts and increase the torque and decrease the top speed.
My wife has major back trouble. She can't walk very far. She has an big Invacare scooter, but it is so big and heavy she has trouble getting it out the van with ramps. But this scooter is only 55#, and easy to get in and out of her van, by herself. I built one for her, and it was so popular I had to make more for my friends. The problem is you can't sell this scooter due to the liability issues, and I can't afford to give any more away.
The scooter is great for a person rehabbing from leg troubles, or other non life threatening troubles. It is good for camp ground transportation. Riding around flee markets. Or just riding for fun.
This video above shows my grandchildren, wife, and my self riding various models. The scooter comes in Gray or Pink.
Check out the manufactures web site for detailed information
https://www.youtube.com/watch?v=g_4SQpk5SJw to watch my grandson riding 3 different scooters.
Choose the Color, Gray or Pink See above 2 pink one gray.
Choose if you can be satisfied with a scooter that only goes forward under power, or do you need a power reverse. If you choose a power reverse model you will increase the cost a couple hundred dollars and increase the amount of work significantly. The $500 model can easily be pushed backwards with a cane, or your foot. The drive wheel freewheels with very little effort.
Choose the seat. The seat supplied by Razor is a bicycle type seat. My wife didn't like it, so I modified the seat and made it much wider, padded it, and covered it with a fabric. I can show you how to do that.
Choose the floor. I make most with a 3/4" peace of plywood, covered with rug of your choice. An other option is aluminum plate. The plate aluminum is slippery. I did make one with the aluminum plate the was in 3 sections, with hinges that allow the sides to be removed so it fits into the back of my pick up truck. See the floor in the above picture the left rear scooter has the folding floor out of aluminum. The floor has wheels to keep the scooter from falling over.
Choose it you need to have more torque to go up a steep slope or if the rider is very heavy. But this modification can be made any time. Build the basic scooter and try it to decide if you need the lower gear.