I’m looking for coursework that digs into BHMA tolerances and real-world variance, not just template tracing. Last week on an 18-gauge fire-rated steel door, a 1/16 in centerline shift using a Templaco jig increased latch preload and put the listing at risk. Any ALOA CEU or DHI class you’d recommend that covers mortise/161 prep accuracy, measurement verification, and preserving hardware integrity on rated openings?
I’d look at DHI’s COR117 — good BHMA location tolerance discussion and how it stacks up on 18‑ga skins; if you need CEUs through ALOA, their hollow‑metal hardware install lab at convention covers 161/mortise verification but is more hands‑on than code-heavy. My field fix for a “1/16 in centerline shift” with a Templaco on fire-rated doors is clamping a 1/8 in sacrificial plate, spotting a 5/32 pilot, then confirming centerlines from both faces before opening with the step bit to keep latch preload down.
We’ve had a few ‘Coverage A over $1M’ installs where the retrofit actuator stalled on old gate valves; now we always swap in a full‑port 1‑inch brass ball valve before mounting the auto-shutoff — adds about 45 minutes but stops the ‘device didn’t actuate’ fight with carriers. If you can’t change the valve, pick a unit that uses its own in‑line ball valve (e.g., not a stem‑turner) to avoid torque issues.
On 18‑ga doors I quit trusting the jig alone — mark the centerline from both faces, clamp a backing plate inside the skin, and spot with a transfer punch; it killed my latch preload issues… Alongside @jules_anna99’s DHI rec, COR140 digs into BHMA A156.115 tolerances and verification, and the ALOA Expo precision door‑prep lab covered shimming for skin flex; if you enroll, ask whether they teach ‘double‑face verification’ and corrective checks. BHMA standards are here: https://www.buildershardware.com/standards.