Source for rubber shock mounts. From my notes:
Original part 348-0007-00 is a hollow rubber ball approx 15mm dia across equator, with a 12mm OD flange at each end. Rubber is about 1.5mm thick. Neck OD 9mm, neck to neck 11mm. Clearance hole for #8 screw. Chassis holes are 5/16" (8mm) diameter.
ACTION: Buy "DJI ZH3-3D Damping Rubber Set (Part 42)", $5.19 at ebay.
This is four bags of four each of four different type isolators. The ball shaped ones (gray "A40" and white "30") are *perfect* drop-in replacements.
FIXED!
NOTE: "DJI Z15 Zenmuse Spare Part 7 Damping Rubber for gimbal gyroscope"
at aliexpress is probably okay too. 6 parts $8. "DJI Zenmuse H4-3D Part 3 Damping Rubber" looks identical to H3-3D part 42. "DJI Zenmuse H3 2d Damping Rubber Part 15" at 3rdrockhobbies is twelve cushions (3 kinds, all ball type) for $5. These look like Barry Controls 275-N1 which are ~$10 each. Parts for the DJI Phantom series are no good; too soft. I don't think there ever was an H2.