Without knowing which generation of Levo you've got, I'll cover the common ones — the "controller on the handlebars" usually means either the TCU/display unit or the remote pod, and they use different tools.
Gen 3 / Gen 4 Levo (2022 onward) — TCU on the top tube, remote on the bars
The handlebar remote (the little pod with the up/down/walk buttons) is held on by a single T25 Torx bolt on the clamp. Loosen it, slide the pod along the bar, retighten to roughly 1 Nm — it's a tiny bolt, easy to strip if you crank it.
Gen 2 Levo (2019–2021) — TCU in the top tube, remote on the bars
Same story: the bar remote clamp is a T25 Torx. Don't go heavy on it.
Gen 1 Levo (2016–2018) — display unit ON the handlebar
If yours is the older Levo where the actual display sits on the bar (not just a remote), the clamp bolt is typically a 4mm hex for the bar clamp. The display itself unclips from its cradle by hand — no tool needed to lift it off, just to reposition the cradle.
A couple of notes
• If it feels stuck, it's torque, not thread-lock — these are low-torque fasteners and should break free with light pressure from a proper-fitting bit. A worn Torx bit will round the head fast.
• If you're trying to remove the remote entirely (not just slide it), on Gen 3/4 there's a cable running into the frame at the headset — you'll need to deal with that end too, which is a bigger job.
• Don't confuse the remote clamp bolt with the bar clamp on the stem — wrong bolt, wrong outcome.
If you can tell me the model year, I'll narrow it down to exactly the bolt and torque for your bike — and shout if it's actually the TCU/display itself you're trying to get off rather than the bar remote, because that's a different procedure.
