On checking,I see that the breaking strain of the 2mm
( 3/32 )wire rope I am using, Is 950 Lbs !!!!!!
When the sear holding the rear piston is released,
the pressure on the rope almost dissapears ,( They are both travelling in the same direction )
Thats in relation to the wire ?
Also when both pistons bounce back off the air cushion the load on the wire diminishes completely ?
I have some 1.6 mm wire ( Thats where I got the 500 Lbs breaking strain from )
And I might well use it ? ( Its well up to the task ) In my opinion.
In my opinion, the 2mm wire is at least 5 times over strength
Having said all of that, Lets not look for what might not work ! A larger wire or even the chain I have could replace it !
Until its up & Shooting, we will never know !!!
I also don,t think the pistons have to be balanced ( They will be ) Or even the same length ( They will be )
The pressure on compression will allways be equal on the face of both pistons, Even if one should arrive early ?
Only a shooting unit will give the answers,
All the best, Ged.