Hy-Score (US version) nternals

[Garvin]

I just added stripdown instructions I found in the AVA library for a Hy-Score 803 to Guy's strips thread.

Interestingly, I also came across these observations by LeonardJ when he stripped a Hy-Score:

"One of the more unusual features, for any spring gun, is the presence of a lubricating wick on the piston head. The next thing that becomes apparent, in spite of being a concentric piston action (barrel runs throught the center of the piston), there is no seal present between the ID of the piston, and the barrel - just a very smooth, close tolerance hole through which the barrel passes - the lubricants form the seal. The piston head is fastened to the skirt of the piston in a manner that allows the head to "float" - no doubt to help maintain a seal. The spring guide also "floats" within the confines of the mainspring ID. The gun uses a common O-ring seal on the piston head, and a proprietary seal within the rear end cap, which seals the main compression tube, so that all the compressed air is directed to the breech, and thus to the pellet."

[cinedux]

Geez,wrong thread.Apologies Dan.

[Shed tuner]

I'd have thought an internal o-ring wouldn't have been that hard to design in ?

[Benelli B76]

I'd have thought an internal o-ring wouldn't have been that hard to design in ?

I make a 3mm thick polyurthane disc with good fit on barrel O.D. which fits nicely in the piston diameter, held in place by a thin steel washer under the compression spring. Don't think you can improve much on that.

Baz

[Shed tuner]

I make a 3mm thick polyurthane disc with good fit on barrel O.D. which fits nicely in the piston diameter, held in place by a thin steel washer under the compression spring. Don't think you can improve much on that.

Baz

job done. they could have done the same with leather...