Does anyone have any information regarding the additional soft parts that would be needed in a SydArm rebuild kit. I know that there are at least 4 new o-rings (2 around the valve and 2 around the CO2 adapter) and a new spring. Are replacements available? Are the 'new' o-rings the same size as other o-rings in a typical rebuild kit? Just looking to take some backups out to the field...