The product photos shows a chromed solid bare with what I would call the wheel pin, and stretcher pin.The actual tool is made of a heavy duty square powder coated or painted steel tube. It has holes to allow different sized wheels to be mounted. And one pin has a sleeve bearing that goes ontop of the nut on the pin it is on.I like how sturdy this tool is. Built like a tank.To prevent the sleeve Dearing from falling off I used a zip tie just above it to make sure the bearing wont slide off in the event I accidently turned the tool upside-down when picking it up.The zip tie doesn't interfere with the wheel bearing in any way.I mounted 2 mountian bike solid tires with no problems.You do need a vice or some way to secure this to a workbench, or in my case a garden wagons folding side panels at a corner using vice grips on a drill press table vice.I highly recommend this tool for anyone with good to strong hand strength.Tips: Wrap the square tube with electrical tape within the wide space between the two sets of holes. Then wrap lengthwise over the entire thing. This provides padding for the vice jaws to grab and not chip your tire tool.Solid tires are going to be 2 to 5 inches smaller than your rim depending on manufacturer.Do not uncool your tires. Leave them coiled up for now.For this next step don't use anything you cook food in.I don't know what substances are used to make solid tires. Yes foam rubber. Or rubber. But what else is mixed in to male them. Those ingredients can possibly leach out into your cooling pot.Wear gloves and eye protection in case of splashing.I used my 10 gallon shop vac bucket. I removed the top and just used the bucket to hold 5 to 6 boiling water kettles of water.Put your still coiled up tires in the bucket.Very carefully poor your water in. For this you could use a larger pot to boil water and poor it in slowly so as not to splash yourself. You just don't want the tires in a cooking pot.The tires will likely want to float a little. Just let them sit for ten minutes. Then grab a piece that is out of the water and carefully flip them over. So the part out of the water now is in the water.Let them sit 10 more minutes.As they sit prepare the vice and tool to use. If your using a shop vac bucket, it has wheels. Roll it over to the vice area if not already there.Take one tire out and cut the tie keeping it coiled.Next just lay it out for about 5 minutes so it relaxes into the typical tire shape. It will look like a tire taco at first.Place the rim on the proper pin. Handrim facing down.The stretcher pin should just barely miss the rim if it's set up correctly.If the tire dried off while resting just dunk it in the warm water so it is wet. It goes on much easier.Placing the tire on the far side of the rim aligning the tire bead with rim bead.As you place the tire you will rock it up and down and pull towards yourself. Keeping the tire squeezing into the rim bead.Do this for half the rim each side. So half the rim DONE.Use your right hand to hold the right side where the tire leaves the rim. Wrap your hand around both the rim and tire. Just hold. You don't need super strength for this. Just average hand strength will be fine.Rotate the other side where the tire leaves the rim close to the stretcher pin. Use your left hand and even right hand to pull the tire over this pin.Once on the pin slide the tire down equal to the rim. Then grasp the wheel left and right pretty equally and turn the wheel clockwise.As you turn your hands will be able to rock the tire and press inwards towards the rim to insure the top bead sits properly. You wi know this when you can't see the groove or bead on the tire.Make sure to go all the way around clockwise. This action causes the top bead to want to set itself. It will take some guidance with your hands. Once you finish clockwise reverse the motion to now make sure the bottom bead is set properly. Same deal as the first.Say you didn't get the bead in all the way one side or for part of the tire.You can remount the wheel onto the tool and using a sturdy screwdriver or small prybar slip the shaft under the tire so it rests on both sides of the rim.Then pry it over the stretcher pin. Then repeat the above process to make sure things are seated.Alternative: You have good hand strength then you can grasp the tire and rock it back and forth and squeeze it into the rim. At this point you have the hardest part done. Getting the tire on the rim.Use water to make things slippery. Soap can also be used sparingly as the water does a fine job alone.And, that's the unglorified job of mounting solid rear wheelchair wheels.This tool is a good value for the money. It cost less to buy this tool and a vice and 2 tires than it costs to have shop replace them.I ? am glad I got this tool for my needs.My images show: The tool once assembled. It's pretty simple with good directions.In one image I used the tool as a Wheelchair jack stand ad I worked on my sideguards. Being very gentle and careful it works pretty well considering.I also included images of the tool mounted on my yard wagon and how I attached it using vice grips.Alternative to using hot or boiling water: leave the tires out on your driveway for an hour in 80 degree or hotter temps to achieve similar results.