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Removing the Gauge End Cap:
Place the original HW100 Cylinder in a vice with protected jaws. The first picture is the correct way. You also have to get the tube centred vertically and it must be VERY TIGHT.
The second picture shows the wrong way to grip the tube - because gripping it at the shoulder where the end screws in can actually grip the internal screw thread of the end cap, making it impos
Once you have gripped the tube correctly, then take the levering bar from our kit and put a thin coat of Molycote 111 or 33 or other similar O-Ring grease on the end and slip it into the filler hole. Make sure the bar goes right through. Then whilst gripping the body of the tube protruding out of the vice with your hand, push/pull down on the steel bar. If it's really tight, give the steel
Removing the block end:
It is very easy to mark or damage the block end cap because the area that needs to be gripped is very narrow and the surface area that a spanner has access to is also very small and very soft in comparison to hardened steel spanners/grips/stilsons.
You CAN use a standard 36mm spanner to remove the end, but as mentioned before the surface area is so small on the flat sides
When re-assembling the tube we always put a small amount of Molykote 33 or our Professional Gun Oil on the o-rings. You only need to put the ends on "firm hand tight" as the pressure will keep the ends in place.