# 4.3.1 Entering span measurements (F, C, O, H) 4.3.1 step-by-step Span measurements define the distance between the thumb hole and each finger hole. Spectre Cloud supports **four span types**, and it's important to enter values under the correct one — the number only means what it's supposed to when it's paired with the right span type. ## 📐 The Four Span Types (Summary) Spectre Cloud uses four span measurement types. Each is explained in full — including how it's measured and when to use it — in **4.3.2**. In brief: - ✅ **Full Span (F)** — the complete measured span, everything included, inserts and all. - ✅ **Cut to Cut (C)** — Full Span minus the insert thickness; used when drilling thumb-first. - ✅ **Outer to Cut (O)** — for interchangeable thumbs; inside of the female interchangeable to the cut of the finger OD hole. - ✅ **Hole to Hole (H)** — biggest hole to biggest hole (what the PBA truck calls "Cut-to-Cut"). **For the full detail on each type, see 4.3.2 — Span types.** This page covers how to *enter* the values once you know which type you're working in. ## 🎳 The Span Fields on the Spec Sheet The two span boxes sit at the center of the spec sheet, directly below the finger holes. For a right-handed bowler: - ✅ The **left box is the middle finger**. - ✅ The **right box is the ring finger**. Enter each finger's span in its box. The values are almost always different from one another, so confirm you're entering each in the correct field. **Note:** The middle and ring finger boxes **flip when you change the bowler's dominant hand**. Because handedness mirrors the layout, switching a bowler from right-handed to left-handed (or vice versa) swaps which box is the middle finger and which is the ring — so always confirm the bowler's hand is set correctly before reading or entering span values. [![SCR-20260728-toqk.png](https://wiki.spectrebowling.com/uploads/images/gallery/2026-07/scaled-1680-/WGQscr-20260728-toqk-png.png)](https://wiki.spectrebowling.com/uploads/images/gallery/2026-07/scaled-1680-/WGQscr-20260728-toqk-png.png) ## 🔘 Reading the F / C / O / H Bubbles Between the two span boxes is a row of four bubbles — **F**, **C**, **O**, **H** — one for each span type. Their shading tells you, at a glance, which span type is currently displayed and which ones already hold a value: [![image.png](https://wiki.spectrebowling.com/uploads/images/gallery/2026-07/scaled-1680-/weQimage-png.png)](https://wiki.spectrebowling.com/uploads/images/gallery/2026-07/scaled-1680-/weQimage-png.png)
Bubble stateMeaning
**Black background**This is the span type **currently being displayed** in the span boxes.
**Grey background**A value is **present** for this span type (but it's not the one currently displayed).
**White background****Nothing is present** — the value for this span type is blank or incomplete.
The bubbles let you switch which span type is shown and immediately see which types are already filled in. A grey bubble means that span exists on the sheet; a white bubble means it doesn't yet. ## ⚙️ Only Cut to Cut Is Automated This is the key thing to understand about span entry: **Cut to Cut is the only span type with any automation behind it.** - ✅ **Cut to Cut (C)** has an automated toggle in the settings — **Autofill Cut to Cut (2.6.9)** — which derives the value from the Full Span and insert dimensions. - ❌ **Full Span, Outer to Cut, and Hole to Hole are manual entry only.** There is no automation behind them — whatever you type is what's recorded. - ❌ **None of the span types have error validation.** Spectre Cloud will not flag a value that's out of range, transposed, or entered under the wrong span type — the entry is taken exactly as given. Because there's no validation catching mistakes, the responsibility for a correct value sits entirely with the person entering it. Confirm the span type and re-check the numbers before saving. ## 🔢 Adjusting Span Increments The values available when entering a span come from a drop-down, and the **increment of that drop-down is adjustable in the settings** (see **2.2.7**). If the default steps are finer or coarser than you like to work in, change the increment so the drop-down offers the values that match your shop's habits. ## 📋 Entering Span — Step by Step 1. Confirm the bowler's **dominant hand** is set correctly — this determines which box is the middle finger and which is the ring. 2. Confirm the **span type** is set correctly (see 4.3.2) — check that the intended bubble (F, C, O, or H) is the one with the black background. 3. Enter the **middle finger** span in its box. 4. Enter the **ring finger** span in its box. 5. Double-check both values against your fitting source before moving on. ### Related Sections - 4.3.2 — The four span types: F, C, O, H - 2.2.7 — Adjusting span measurement increments - 4.2.4 — Identifying grip type from a measurement sheet - 2.6.9 — Autofill Cut to Cut: the one automated span toggle - 4.4.5 — Inputting pitches **Tip:** Glance at the bubble row before you save. A black bubble tells you which span you're looking at, and the grey ones tell you which other spans are already on file — an easy way to confirm nothing you meant to enter was left white and blank.