THANKS , But Now After Installing The Reg How Can I Tell The Fill Pressure?

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First off make sure all the air pressure is bled off. The air fill assembly screws into the iar tube. The air tube also screws onto the reciever. It should not be all that tight as the orings seal the assemblies . Mine came apart quute easily. 

I installed a Robert Lane reg in mine and it came with full instructions. The only thing missing was a 3 mm bolt to pull the reg into place in case its pushed in to far. Which I did and didnt have the 3 mm bolt. The Lane reg came preset to 140 bar, although you can have him adjust it to what ever you want. 
 
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Mine was super tight. I had a piece of rubber that was about 1/8” thick. I wrapped that around the air tube and held it as tight as I could. I had my wife use an open end wrench on the gauge block to turn the valve body to unscrew it while I held the airtube. The rubber didnt slip on the metal air tube and allowed me to hokd it very tight. As others have said make sure all the air is removed first. 
 
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I used the same technique as LDP did. I have seen a few tools made for this job, I just never bought one. They would be nice to have though. I’ll find a few links for them. 

https://m.facebook.com/media/set/?set=a.1224465031014783.1073741883.579626178832008&type=3



https://www.xtxair.com/air-arms-fill-valve-tool-s400-s410-s510-ev2-tdr-ftp900

https://www.xtxair.com/cylinder-clamp-32mm-ali

i just took mine apart yesterday (twice just for rebuild of reg and new gauge install. I wish I would have bought the after market front gauge/fill port. Would be nice to have one gauge reading the regulator pressure and one reading the cylinder pressure. 
 
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The end caps are on pretty tight,I can hold it in my vice but, what do I

use to turn it off? Is there a special tool? Or do I have fabricate something?
Click to expand...

If you have the air tube in the vice use an open end wrench on the air gauge block to unscrew the valve body. If you have the valve body on the vice then a strap wrench or something similar that wont crush or damage the air tube. 
 
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The tool I used. http://laneregulators.com/shop/air-arms#/tools-c72/sort=p.sort_order/order=ASC/limit=50

I couldn't get anything else to work without risking damage to the tube or threads. I was able to get mine off by putting the tube into the full width end vise on my wood working bench.

Took lots of pressure and strips of rubber to finally stop the very polished tube from spinning. Still took a heat gun, breaker bar, a cheater pipe and a dead blow hammer to break the end cap loose.

The vent hole in mine wouldn't stop leaking until I really really polished the ID of the tube. I didn't want to try cleaning the tube with one end still sealed...
 
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