[StealthFundip]

Now that I've resolved to get my L96 in peak operating condition, I've finally got around to installing my JJ Airsoft PDI Clone hopup chamber. I ordered a set of PDI High hopup arms and was pleasantly surprised to find they fit perfectly.
However, the O-ring that applies pressure to the arms isn't pushing them down to the adjustment screws -- In fact, there are several millimeters of play between the arms and screws. I don't want to put all the effort into making this stay if I'll need to take it all apart again before my next game day, so I'm looking for some pointers.

What have you used as a replacement for the infamous PDI mega O-ring?

 

[powerdwarf]

Don't action army and airsoftpro do hop ups? I've had a type 96 airsoftpro hop up and their quite nice. Although try shimming your arm it always helps

 

[ghost ghillie]

umm i haven't used one but...
a rubber band would do the trick i guess...
all i can see that you might need to do is tape it or stick it inside a tube around the area where it touches the arms

as in take the rubber band and twist it (making it go over the hop-up twice) and cut a smal tube or use the plastic around a wire to stop it form sticking to the arms.

after all. i have no other tips than getting a new o-ring from a mechanic store thingy <,>

 

[Plazmaburn]

If memory serves, you have to cut and modify the o-ring to fit properly. I remember reading that somewhere.

 

[shortylumber]

Could you not use a smaller oring?

 

[Killer]

i filed the sides of the arms down so they dont cut into the rubber, then used two smaller (thinner, and smaller in diameter) orings side-by-side.

 

[StealthFundip]

Thanks for all the replies everyone! The O-ring that came with my chamber was a bit smaller than the diameter of the chamber, and was a pain to get into place. No modifications necessary, just 20 minutes of extremely furious finger fumbling.

I suppose I could spare a dollar every 6 months or so and replace it outright to keep it springy, I don't know if I could trust a rubber band :/

Killer, that's a good idea! I didn't think about the arms cutting into a smaller O-ring. But why two O-rings? Is that for redundancy or just what you had lying around at the time?
Actually, the arms that came with the JJ Airsoft chamber had grooves cut into them to prevent that. The $15 PDI high arms don't...

 

[ghost ghillie]

Thanks for all the replies everyone! The O-ring that came with my chamber was a bit smaller than the diameter of the chamber, and was a pain to get into place. No modifications necessary, just 20 minutes of extremely furious finger fumbling.

I suppose I could spare a dollar every 6 months or so and replace it outright to keep it springy, I don't know if I could trust a rubber band :/

Killer, that's a good idea! I didn't think about the arms cutting into a smaller O-ring. But why two O-rings? Is that for redundancy or just what you had lying around at the time?
Actually, the arms that came with the JJ Airsoft chamber had grooves cut into them to prevent that. The $15 PDI high arms don't...

well the rubber band idea was just a makeshift fix.
i tough you needed a fix right away :hehe:
so no its not going to last you any more than some days. but hey it will work if the oring brakes on a 2 day millsim event, as a quick fix. so you can play in the event instead of wasting time trying to find a new oring and miss out on half a day >

 

[StealthFundip]

Oh no, it's "too cold" here for anyone I play with to step outside. I have months before I'll be fielding my rifle again!

I agree with ya, I'd be cobbling whatever I had together to get my rifle working for a multi-day event. If I dropped that much money, I would make sure that I get my money's worth. Might keep a few rubber bands in my toolbox now, actually.

I did some googling and saw people outright replacing their O-rings with rubber bands, and wondered if there was any benefit. Looks like they opted for the DIY fix instead of buying a new O-ring.

 

[ghost ghillie]

Oh no, it's "too cold" here for anyone I play with to step outside. I have months before I'll be fielding my rifle again!

I agree with ya, I'd be cobbling whatever I had together to get my rifle working for a multi-day event. If I dropped that much money, I would make sure that I get my money's worth. Might keep a few rubber bands in my toolbox now, actually.

I did some googling and saw people outright replacing their O-rings with rubber bands, and wondered if there was any benefit. Looks like they opted for the DIY fix instead of buying a new O-ring.

well o rings aren't exactly springy. and there made to be squished to be used as air seals. and not pulled like in the hop-up chamber. so that might be a reason they just swapped it for rubber bands :shrug: