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Yes, the "Magnum" hand pump is larger than the "Mares" style pump that is used today. Remember that Scubapro were looking to differentiate their product line and the USA was their chief market, so everything had to be beefier and better and also a larger bore pump produced a shorter pumping time.
If it has the factory pressure then it will not be pumped up to the maximum, most likely it will be at 20 to 25 atm. The maximum pressure is 30 atm, but better to use it "as is" in order to perfect your loading technique, only then think about pumping it up. Section 5.3 of the handbook tells you the number of pump strokes to obtain a certain level of pressure in the gun, the table assumes that you start off from empty. A quick way to check a new gun on land is to place it vertically with the butt on your foot close in to your ankle, fill the muzzle up with water from a jug (not much water is required) and then insert the spear into the muzzle. Use the loader to push the shaft into the gun and you will feel how much effort is required. Don't actually latch the gun or you will have a potentially dangerous situation. If you do latch the gun then immediately press the speartip against a wooden block placed on the ground, put all your body weight onto the rear end of the gun and slowly squeeze the trigger while resisting the gun coming up with your weight. This allows a controlled discharge of the gun and is the only safe way of doing it. Never fire the gun on land with or without the spear in the gun, not only is such an act very dangerous there is the real prospect of smashing the plastic piston and shock absorbing anvil.
Those gadgets are expensive, price is AU$383, more than a speargun!Can't you just buy the gauge that fits in the gun, then screw it in before or after it's pumped up, and then it should show the proper pressure in the gun? That way you don't need alot of stuff to do the trick, just the gauge.
Like when you fill air in the tires of a car, it will show you the tire pressure even though it's not connected to an airhose. It's not important right now, so I'll figure something out along the way
I just noticed that the original color scheme "Vintair" 35 cm gun is selling out at $130, which is very cheap.
Sadly not... Still just too much of a hobby for me and rarely time enough. There's an easy, more rudimentary way of doing it that might just work.Exactly what i had in mind about the gauge.
Do you make extras for selling?
There used to be a search function which enabled beginners to find out if what they wanted to know had already been discussed, but not many seem to use it.
