I believe the mast and electrical connection you refer to is a pin that will fire through the spool to crank it up a few ratchets and then lock it in place in a frontal impact.
I wouldn't want to rely on a retrofited belt in a major head on accident. Risk vs savings doesnt pan out.
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Terry Allison
N. Calif. & Boca Chica, Panama
09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)
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