Paronite seems to be made of compressed asbestos. Don't use it, unless you want lung cancer.


quick Google search and it looks like its made from asbestos. i would suggest against it.


Thats bad. I can't really find anything as hard as paronite, but I have some kind of other sealing gasket ...

Today I went to my local hardware shop and searched for a good and hard rubber for the sealing face of my piston but there were only some black, quite soft rubber sealing gaskets and some paranite ones. The soft ones work for lower pressure, but how about paranite? It was quite hard...

If it bothers you to take the barrel off then don't worry, I'll be waiting!

Thanks for the reply! I can pretty much imagine how it looks like so don't worry about that but a picture of the rifling tool or the rifling would be great.
In this forum there are many guns with rifled barrels but no one has built a gun with a steel rifled barrel(as far as I know) which, in my ...

Pretty nice gun, but one big question remains - How did you exactly rifle a STEEL(!) barrel? How did the tool look like is it still usable? Pictures of the rifled barrel(If you don't bother to take the barrel off, of course) and pictures of the rifling tool would be great.

Yeah but nothing much is different from yours and the one in the video you just have those washers for centering and keeping the rubber washer in place on the pumps shaft. The rubber washer in your picture looks like a cup shaped one too.

mark.f wrote:Nope, that one is machined from a rubber tap washer (used in faucets) into the cup shape. Mines just a rubber washer (thin).

Then I don't get how does yours work. Sorry.

If your big chunk of rubber doesn't work, you can also make a rubber cup seal out of standard parts and a rubber washer (pictured below).

Dammit.... How didn't I thought about that? Never mind...I'll still try mine even though it looks a lot more work to get done than rubber cup seal even if I ...

I've already heard about them. They look pretty good an easily made but I don't now were to get leather for this and as I already started work on the rubber cup I won't stop it.

i don't think super glue will last very long, you should get some rubber cement. you can get it from tire repair kit. aslo you could have just make your own size orng by cutting a oring and superglueing it back.


I'll see if it holds and if not then I'll try with rubber cement.


The rubber will ...

I was making a stirrup pump to finally ramp up pressure in my barrel sealing pneumatic till I realised that I had no access to O rings smaller than 1 1/2''
in diameter so I couldn't keep following the Gipetto's tutorial.
But then I thought about a cup pistons found in normal pumps and I started ...