Things I liked:My Sheridan Blue Streak is so old it has a steel rod for a bolt handle and had the bluing worn off behind the rear sight by the time I got it used in 1967. Considering it's age, overall the kit parts were as close to the originals as I could have hoped for. Stacey was very helpful with suggestions on how to deal with the valve guide when it didn't want to pull out. The critically needed seals and piston cup from the kit have given my vintage Sheridan many more years of life. The included tool is a must have to take on this repair. Things I would have changed:Adding some comments about what can be done to to help free the valve guide part 28 without risk of damaging anything if the guide seems stuck when first attempting to pull it out would be a big help, as wood a much clearer and larger exploded diagram. A note to indicate whether or not a slight difference in the length of the valve stem of part 31 and the original valve's stem would make any difference would be helpful. What others should know:Be sure to clean up the edge of the valve seats in the end of the air chamber and on the end of the valve guide where the rubber seals contact before reassembly, and if the gun doesn't pump or hold air well at first and you cleaned everything the best you can and are sure you put everything back together properly, keep operating the mechansim occasionally and leave air in it if it pumps up any at all, and wait a day or two before going into panic mode.
On my Blue Streak the stem of the piston valve, part 31 in the kit, is about 1/16" or so longer then the kit part because of a steel pin sticking out of the firing pin end that the kit part doesn't have. I removed the seal from the kit valve and after having the "fun" of digging out the hardened seal in the original valve I found the new seal was a perfect fit, and discovered the original valve stem and cup holding the seal are separate pieces.
The kit spring part 23 feels slightly softer when squeezed then the original spring, so I didn't use it. The bolt on my Blue Streak is a simpler design then the bolt in the exploded diagram and doesn't have any O rings so I didn't need part 19.