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1310-C
Ret-ro rules in-line, adaptation of 1225-design, using two construction methods (“hybrid-build” technique); all-wire frame with “damper” main rails; separate torsional center-guide section attached to motor box built to be as narrow as possible using only four side-by-side pieces of 0.047” wire, with torsional flanking pans made of 0.010” brass sheet backed with 0.039” wire (wire version of “double-V” cut); separate left-right torsional rails attached to motor box for front axle uprights; torsional 0.010” brass sheet backed with 0.039” wire inner side pans and perimeter wire outer side “pans”.
1310-Ca (not pictured)
Same as 1310-C except angled motor bracket is used to allow non-hypoid inline gear mesh (armature shaft centered on rear axle) while keeping the front (endbell) of the motor even with the bottom plane of the chassis.
Both chassis subsequently refitted with variable spring-wire tension system between center-guide section / front-axle uprights for "chassis tuning".