Hi guys I have a slow leak around a valve stem on my L235. I started looking and found they have valve stem that can be replaced without breaking the bead of the tire. It seem like it will be a lot easier and cheaper than bringing it to a tire shop any I can get "4" for $20. I was wondering has anyone ever used this type and what are the Pro's / Con's of using them? Also they have different sizes, does anyone know what is the size of the hole the stem goes in on a L235. Thanks