At macro distances, tiny vibrations are greatly magnified, so this is a support and handling problem as much as a focus problem.

Helpful options:

• Use a sturdier tripod/head. For video focus pulls, a heavier tripod and a more robust head—ideally with fluid drag—will resist vibration better than a light stills tripod. Avoid raising the center column if possible.
• Add leverage to the focus ring. A simple DIY handle on the ring lets you apply gentle tangential force instead of gripping and twisting the ring directly, which can reduce shake.
• If the scene is static, fake the pull in post. Shoot a series of still frames at different focus distances (or just start/end frames for a snap change), then assemble them into video. If needed, align the frames in software to remove jitter.

So: for real-time focus pulls, better support plus a gentler way to turn the ring helps most. For static product shots, shooting separate frames and assembling them later is often the cleanest low-cost solution.