This is my solution of sealing the barrel on my Mares Cyrano pneumatic gun. It is easy to make and versatile in using. It is also tolerance forgiving (because of using a small piece of sling rubber tubing over the O-ring and adjacent plastic rings. I use it with 6,5 mm shaft instead of original 7 mm.
The gun needs some kind of adapter on the muzzle to make the hole deeper for fitting the Tomba (15 mm x 11,4 mm in addition to 4 mm in the muzzle). I made it in inox. There are other solutions too. Sealing the holes in the muzzle is done with rubber tubing which is pulled over the muzzle. Tomba could be used like Tovarich as on the picture. But also like slider as in Kara-yo, Karamba or Mamba or even a classic gun if you pull off the rubber tubing from the muzzle.
Assembling Tomba on the shaft
Tomba assembly ready for use
Tomba sealing test
Tomba stays in place after shooting if the friction between tomba and the muzzle is sufficient for firm connection (like plug in the bottle), and between the tomba and the shaft as low as possible, but sufficient for good sealing. This is accomplished choosing the right diameter for plastic part that fits in the muzzle and for the rings adjacent to O-ring. O-ring is 6x2 mm what makes the diameter about 10,5 mm on the shaft. Plastic rings diameter is 11,8 mm (depends on the used rubber over the rings) Inner diameter of the plastic rings are 6,6 mm. The biggest plastic part could have the inner diameter 7,2 mm (so it could be used with 7 mm shaft also). I measured the friction between tomba and the shaft. It was about 0,2 kg (2 N). But I would secure the tomba at the muzzle, for any case, with piece of spectra.
The gun needs some kind of adapter on the muzzle to make the hole deeper for fitting the Tomba (15 mm x 11,4 mm in addition to 4 mm in the muzzle). I made it in inox. There are other solutions too. Sealing the holes in the muzzle is done with rubber tubing which is pulled over the muzzle. Tomba could be used like Tovarich as on the picture. But also like slider as in Kara-yo, Karamba or Mamba or even a classic gun if you pull off the rubber tubing from the muzzle.
Assembling Tomba on the shaft
Tomba assembly ready for use
Tomba sealing test
Tomba stays in place after shooting if the friction between tomba and the muzzle is sufficient for firm connection (like plug in the bottle), and between the tomba and the shaft as low as possible, but sufficient for good sealing. This is accomplished choosing the right diameter for plastic part that fits in the muzzle and for the rings adjacent to O-ring. O-ring is 6x2 mm what makes the diameter about 10,5 mm on the shaft. Plastic rings diameter is 11,8 mm (depends on the used rubber over the rings) Inner diameter of the plastic rings are 6,6 mm. The biggest plastic part could have the inner diameter 7,2 mm (so it could be used with 7 mm shaft also). I measured the friction between tomba and the shaft. It was about 0,2 kg (2 N). But I would secure the tomba at the muzzle, for any case, with piece of spectra.
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