C/A Arm Length

[Siponarius 17]

Picked up a used Reactor 6000 (love me that HX Sorb!), and I like the way it fits,  but the arms appear 1/2” - 3/4” too long. 

Is there something I can do to shorten them, or will mucking around with the elbow cap straps help shorten then? I see some older but similar looking “Pro” models have a strap to shorten them. 

[IPv6Freely 2100]

When I had a reactor i gathered about an inch at the top of the arms stitched using a speedy stitcher. Worked really well.