Recent content by monsterpcp

See my last paragraph for ordering information. Today, I ordered these inexpensive piston/pump heads. Beforehand, I opened up my Aspen to measure the pump piston (gun now back together). The third-stage metal piston measured about 5.85mm in diameter at its widest (wider o-ring seals center the...

Even better, choose between filling your Aspen or Freedom for 20 or 100 full-power shots in the moment, to suit your needs. Before I describe the simple plumbing required, may I explain why I think this will prove a popular mod? Shooting the Aspen exceeded my expectations. However, the pump has...

Sorry, Roscodog, but I didn't see your post until now. I'll try to get the info to you.

See the photos. I note that these replacement third-stage pump heads are very similar to those in the Seneca Aspen and Nova Freedom. Ten (10) of them for $5.00 USD with free shipping from China. Other photos show the sealing ring being two-piece - an o-ring and adjacent sleeve. Perhaps these...

Don't be afraid to open that air release. It's routine, and not scary at all. The screw and seat are well-engineered, metal to metal, bullet-proof tough. Once cracked open (counter-clockwise), you'll hear the gun hissing for a few seconds as air escapes. The screw need only be opened 1/3 turn to...

The seal on the smallest pump piston has failed. Don't force it any further: It won't get better. The symptoms you describe are those that my gun exhibited when my pump failed. You are past solving the problem by additional lubing. I fixed my Seneca Aspen (aka Nova Freedom) pump after online...

Lube, o-ring, or a design flaw the problem? I think that much more lube than the owner's manual indicates is necessary. I'd advise new guns be fed 6 or 7 drops of lube immediately, then another 6 drops after the first 100 shots, then 2 or 3 drops every 100 shots thereafter. If I had lubed in...

I added to my QB78 collection by buying a QB78S at a giveaway price. I assume they weren't a big seller at Walmart. The synthetic stock seems extremely well made and fit. That said, the weird pistol grip and look-through butt are a pain at the shooting bench when using a rear bag, and the gun is...

Thanks for your reply. Last evening, when I ordered the metric o-rings that I described for the .177 QB, I also ordered o-rings for my Seneca Aspen/Nova Freedom bolt. When I bought the Aspen in January, it came with spare bolt o-rings (takes two). I carefully measured those spare rings with my...

PROBLEM SOLVED IN LAST TWO SENTENCES Hi. I need to change the bolt o-ring on my .177 QB78. I know how to take the gun apart, and rebuilt it recently. But, I don't want to strip it down again just to change the bolt o-ring. Can anyone offer advice on how to change that too-tight o-ring without...

Hi. I need to change the bolt o-ring on my .177 QB78. I know how to take the gun apart, and rebuilt it recently. But, I don't want to strip it down again just to change the bolt o-ring. Can anyone offer advice on how to change that o-ring without disassembly? NEVER MIND. POSTED IN WRONG FORUM

My reservoir doesn't leak. The pump moves air properly: I've not noticed having to pump more frequently. As to filling with a tank or pump, if not using the built-in pump, it's frustrating to have to fill after just 10-15 shots due to a tiny reservoir, tiny by design 'cause there's a built-in...

The part that binds is the small, pencil size piston in the final chamber tube. This is where the highest psi air is pushed into the reservoir. Compressing air creates its own heat, made worse by o-ring friction. From the factory, the piston is sealed by a single, wide o-ring. You can't oil that...

If I could do it again, I'd buy the Nova LIBERTY. It shares the shooting components of my Seneca Aspen, but deletes the pump in favor of a larger reservoir. Lighter, too. My pump failed after about 1500 rounds - most at 2200 psi (purchased at AD when they got their new stock in January, 2019). I...

CAUTIONARY TALE AND A SUGGESTION: I've owned my Seneca Aspen for one month. It shoots one hole, often pellet-sized, groups consistently at 25 yards from the bench. However, I consider buying that Seneca Aspen a mistake because the built-in pump failed early. With help from readers here, I...