Gretsch Junior Jet_0009_4 Published October 12, 2015 at 900 × 600 in Upgrading a Gretsch Junior Jet. ← Previous Next → Here you can see the neck pickup cavity matching the bridge pickup cavity with the slight perimeter around the pickup cover. This looks much nicer than if we had just routed for the P-90, or tried to fill the route on the bridge pickup.