This is how to install a simple Schrader valve in the end cap of fox or any other brand shocks with reservoir that use factory rubber seal.
Schrader valves: https://ebay.us/flkvCC
Nitrogen regulator fill : https://ebay.us/UBrxHg
Nitrogen needle: https://ebay.us/46fB41
You can pitch in a dollar or more @ PayPal.me/4rgam or @ http://www.ko-fi.com/fuzzyhat