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Sir, lower rubber should be stretched ( pretensioned ) to certain lenght ( depending on thickness and length of upper rubber ) and then you should tie dyneema on it ... in perfect circumstances , when gun is loaded both rubbers should be extended to their optimal lenght ( in most cases it"s around 3x ( or 300%) of the original lenght ) ... The most simple setup is with two same rubbers ( same type and thickness ) , then you cut them to the same length (slightly less than 1/3 of the gun length from arrow pin to gun muzzle) then pretension lower rubber at (let's say) 2x ( or 200%) and then tie dyneema ! This way when gun is loaded you will have both rubbers stretched to the optimal length (300%) through the whole length of speargun, and you will have almost no recoil !

Dyneema 2mm !!

Scusa il pretenzionamento non lo calcoli???????????

Scusa il pretenzionamento?????????

Antonio Smiriglio: taglia un pezzo del guida asta se è di quello adesivo e ci fai passare il dyneema in quella parte tagliata

in un fucile con guida asta come si puo fare?

100

quanto è lungo il fucile?

6.5

l'asta di quanto è.