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PIERCING WISHBONES
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PIERCING: a new wishbone concept

TECHNICAL SPECIFICATIONS: The “ PIERCING” wishbones is and essential and solid tool , and it's the synthesis of a great construction technology.
The bail arm is made of AISI 316 crude (cold drawing process to increase its mechanic strength).
The two spheres are AISI 316 made, machined from solid with C.N.C. The spheres are perforated d.2 and are joined to the bail-arm by TIG welding that can directly melt and merge the ball to the crude rod without any additional material; then everything is pickled, which allows to reactivate, after welding, the antioxidant function of chromium in the AISI 316 avoiding desoldering and oxidation.

PRACTICAL ADVANTAGES: the "PIERCING" wishbone is available in three measures L1 -L2- L3 ( length 1-2-3 where three represents the maximum length ) to obtain, with various diameters of the rubber bands, the same ease of hooking it to the shaft.
Extreme things lovers and who has the right handedness can equip the very short PIERCING L1 also on 19mm rubber bands with which it was tested (as well as the other) with a tensile load of 90Kg manifesting minimal deformation (due to the crude material by springs ).
Its weight is pretty insignificant compared to a Dyneema wishbone. Noiseless on the shot is fantastic because the two cones of the rubber bands, where tie is made let escape only a small portion of crude line and when, on the shot, the band is reversed, the latex is the one that impacts with the barrel, producing a noise identical to a Dyneema wishbone.

What are the benefits?

It is very short but rigid, distances the rubber bands and allows you to have a sight where the shaft becomes a pointing rib, facilitating the shooting and avoiding pointing errors. Dyneema is excellent but because of its softness, the rubber bands go one over the other and we have to get used for a more complicated to find pointing sight.
Another important feature is the ability to use the PIERCING wishbone on shafts with long lasting notches and pins: there is no wear during the loadings.
But the most interesting thing is that with this new wishbone concept we can have a sphere (for tying textile) with a diameter of 5 mm, very small compared with the normal 8mm spheres , and which therefore allows you to have a more restrained of bands bulge near the tie, with a consequent decrease of friction on the shot which, together with low weight, gives its contribution in terms of ballistic performance.
The width of the wishbone is 30mm, the length varies according to the model.

Click for full size pic
Click per ingrandire PIERCING wishbone L1 17mm length including the sphere d.5mm
Recommended for 14mm rubber bands but can be equipped as extreme wishbone on other diameters.
Click per ingrandire PIERCING wishbone L1 equipped on Skinner Ergo 90 with 14mm bands.
Click per ingrandire PIERCING wishbone L2 24mm length including the sphere d.5mm
Recommended for 16mm rubber bands but can be equipped as extreme wishbone on other diameters.
Click per ingrandire PIERCING wishbone L2 equipped on Skinner Ergo 90 with 16mm bands.
Click per ingrandire PIERCING wishbone L3 32mm length incluiding the sphere d.5mm
Recommended for 17.5mm rubber bands but can be equipped as extreme wishbone on other diameters.
Click per ingrandire PIERCING wishbone L3 equipped on Skinner Ergo 90 with 17.5mm bands.
Click per ingrandire Comparison between the three PIERCING wishbones L1 - L2 - L3

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