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Send me a PM with your shipping address and I'll send you one. Merry Christmas, Charles

Ask me why I'm not shocked by this. Well, what is says is there is a weakness in the design at this point. I had to rethread the 5mm holes to 6mm and even then and with loctite blue -- they come loose when it is pumped to 26 bar. The recoil is more than this design can take, in my opinion. It...

And my new Vortek has a lightened color where it contacts the cylinder wall, but I think that's normal. I'm just getting into shooting my HW90 again, and did a couple groups of 5 shots at 10 meters in the house and pumped to just 15 bar pressure. The best group was with Crosman ultra mag...

Well, I was easily able to remove that silicone o-ring behind the piston seal, all from the back of the receiver without removing the barrel block. At this point, I need to simply confirm restored accuracy, so I also replaced even the Viton twin o-rings inside the piston with the originals and...

Well, I told you if the o-ring behind the piston seal is a big fail, you'd be the second to know! Accuracy was consistently inconsistent. With each 5 shot group with various pellets, two or three would often make one ragged hole at 10 meters indoors, but then two would be way off. I finally...

Correction: Loctite 242 (blue) is cured in just 6 hours at 72 degrees. The 24 cure is when the temp is only 39 degrees, such as in your garage on a cool winter day. I put slivers of masking tape on my two front mount bolts/screws to be able to see easily if they loosen during firing, even...

Just click on any thumbnail pic to see it up close.... Those are two photos taken today. One showing the red 27x29x1mm silicone o-ring (hardness 70A), mounted on my piston in that otherwise unused factory groove. The piston with that o-ring seemed to slide into the receiver cylinder bore rather...

Ahhh my friends, welcome to my HW90 cookout. Our specialty today is northern germanic seal. How do you like yours? Well done? Please check the photos below to make your selection. (tongue in cheek, that is). OK. So, how to avoid cooking your HW90 (or any springer!) piston seal. Simple. Never...

Just so you know that your tax dollars are being well spent by the snooping CIA, note my above quote from post #32 of this very thread on October 7th and note the White House news headlines for yesterday, October 22nd. I coined the above phrase "mega maga" here and now it made world news just...

Still waiting on o-rings to go "just" behind the piston seal in that groove, but I have something to share: When I tried fitting the teflon 28x30x1mm o-ring, it was too loose, but I decided to cut it and see how that would go...... not well. It was still a very tight fit but I did get it to go...

I tried fitting the 28mmx30mmx1mm teflon o-ring to the empty groove on the HW90 piston. The o-ring was spec'd at 28mmID and the groove is precisely 28mm, but the o-ring had an ID which was larger than 28mm, so it didn't seat tightly in the groove. In other words, it didn't work as the piston...

I seriously considered 20 cal as I thought it might be the best overall to my needs. It was only pellet choices in .22 that swayed me that way. My take is the Beeman versions had even better QC -- but at a price, of course. I've had a number of minor issues with my Weihrauch. I like it very...

Today, I received in Viton o-rings to potentially replace the two o-rings which go in the end of the HW90 piston. The originals were more supple with less friction than the Viton. The Viton were more slightly more rigid and less compressible by about 50%, but the added friction has me decided to...

I would like to think my little joke about the evils of "vapor lock", three posts up, made you smile a little. However, what I was jokingly alluding to there is actually a possible reason Weihrauch didn't choose to use this o-ring groove, after all, but simply left the groove empty, perhaps...

g. Almost forgot this benefit: the piston seal is always going to allow some super compressed air to blow backwards with each shot. How much? Who knows. The same amount blowing by each shot? No. It must necessarily vary. Now, the air space or volume between the piston seal edge and this...

My piston, sans seal and waiting on the o-ring

If not too boring, I would like to restate the case why is may make sense to put an o-ring into the slot behind the piston seal that was clearly made to take just such an o-ring. So much so, that when I first saw this groove, I thought Weihrauch workers had missed installing mine! So, why put...

And should anyone wish to try a low friction o-ring just behind the piston seal, the one which will fit must be 28mmID x 30mmOD, metric again, meaning the cross-section is 1mm. The only place that has them in stock to my knowledge is oringsandmore.com part number 281MMP in hard, pure PTFE. I...

I have news: No-where on the internet, as if by some secret plot (*lol), is to be easily discovered the correct dimensions of the o-ring "pair" used on the HW90 which are seated "inside" the piston at the rear, one being backed up by a white delrin backer for reinforcement.... until now! One...

I got in more high quality schrader valve cores in case someone here has a need. These were chosen to meet the high pressure needs in our HW90 guns. They are USA made Dill 302-DN. They open at 80psi and are rated 2000psi. They are meant to be used in high pressure struts and the like. Easy to...