Get some acetone at a Hardware Store before you start. A pint will do. Unplug the dryer from 110 VAC. Pull the top off of the dryer, by lifting it from the front first. It is attached with snap metal fittings. Do not completely remove the top, just tip upright to gain access to the front interior of the dryer. Before you pull any wires from the door switch, record which color wires go to which terminals on the door switch. If you reassemble the connections incorrectly, the gas value will not open, and the dryer will not heat. In one combination the door light does come on, but the gas valve to the burner will not open although the electric ignition will work. The vertical front could be attached by either snap fittings or sheet metal screws or some combination. You will likely need a Nut Driver or Philips head screw driver. The plastic door light assembly may be brittle from years of heat. You should consider replacing this item. Remove the front panel completely. It will lift out of it bottom fittings. While you have the dryer apart, vacuum all the lint out. Vacuum out the dryer exhaust pipe. This will reduce the fire hazard. If your exhaust hose is flexible plastic or aluminum, get rid of it. It is a major fire hazard and burning lint is nearly explosive. Yes, Aluminum will burn. Replace it with Sheet Metal Steel Ducting. The old Felt Glide Assembly was removed by ripping it off the surface of the drum lip support, and then using Acetone to completely clean the surface. With some effort, the old adhesive and felt left behind will come off easily. Some of the felt at about the 10:00 o'clock position on the frame next to the Felt Guide Assembly will likely be worn, so use some of the removed felt to replace that portion that is worn. You may need to replace about a 4 inch section. What felt you reuse will likely have rust in it and some of your clothes will have "spider" looking rust stains. This is because the clothes being dried have been caught between the worn felt "seal" and the rotating drum, collecting the rust. The rust will come out of your clothes with multiple washings. Clean the reused felt with water, and get all the rust out. If you have a wet vac, you will be able to get the reused felt dry very quickly, in minutes. In an extreme condition of wear, the entire felt "seal" should be removed and replaced along with the Felt Guide Assembly. Once the metal surface is COMPLETELY clean, apply the included adhesive to the metal surface. Remember that about 1/8 inch of the Felt Glide Assembly will extend into the drum where the clothes are dried, so apply the adhesive only on that portion of the felt that will come in contact with metal drum (which is most of the felt). The adhesive will set in 3 minutes so do not delay. It will take about 10 minutes for the adhesive to fully adhere to the Felt Glide Assembly to drum. Once that has occurred, you can reassemble the dryer, and it will be ready to go by the time you get all the pieces back together.
The entire project from first disconnecting the electrical power to the dryer assembly, end of clean up, and testing and ready to use, took about 3 hours. That time is by somebody who did this project only once before about 10 years earlier, but has some moderate to advanced mechanic skills. Anybody can do this job. Just give yourself plenty of time. The first time around, from start to ready-to-use took about 5 hours.