{"product_id":"watch-mainspring-size-calculator-tool-usb-watchmaker-repair-software-eta-seiko","title":"Watch Mainspring Size Calculator Tool USB — Watchmaker Repair Software ETA Seiko","description":"\u003cdiv\u003e\u003cdiv\u003e\n\u003c!--end-header-3dsellers.com-ld-html--\u003e\u003ctable style=\"color: rgb(0, 0, 0)\"\u003e\u003ctbody\u003e\u003ctr\u003e\u003ctd class=\"line-content\"\u003e\u003cbr\u003e\u003c\/td\u003e\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cdiv\u003e\n\u003cp\u003eMAINSPRING CALCULATOR\u003c\/p\u003e\n\u003cp\u003eProfessional Watch Repair Software\u003c\/p\u003e\n\u003cp\u003eby RedRoosterUK.co.uk\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cp\u003eTIRED OF ORDERING THE WRONG MAINSPRING?\u003c\/p\u003e\n\u003cp\u003eIf you've ever measured a barrel, guessed at the spring size, ordered from a supplier, and then found it doesn't fit — you know how frustrating (and expensive) that is.\u003c\/p\u003e\n\u003cp\u003eThis calculator takes your barrel measurements and tells you exactly what mainspring you need: the height, thickness, length, and material. \u003cstrong\u003eNo more guesswork. No more wasted orders.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWorks for watches AND clocks — manual wind, automatic, pocket watches, and clock movements.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cp\u003eWHAT YOU GET\u003c\/p\u003e\n\u003cp\u003e✓ \u003cstrong\u003eMainspring Calculator\u003c\/strong\u003e — HTML software, runs in any web browser\u003c\/p\u003e\n\u003cp\u003e✓ \u003cstrong\u003eUser Guide PDF\u003c\/strong\u003e — full instructions with measurement reference tables\u003c\/p\u003e\n\u003cp\u003e✓ \u003cstrong\u003eSingle-user commercial license\u003c\/strong\u003e — use it in your workshop or business\u003c\/p\u003e\n\u003cp\u003e✓ \u003cstrong\u003eAll files on a USB stick\u003c\/strong\u003e — plug in and go, nothing to install\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cp\u003eHOW IT WORKS\u003c\/p\u003e\n\u003cp\u003e1. \u003cstrong\u003eMeasure your barrel\u003c\/strong\u003e (internal diameter, depth, and arbor diameter)\u003c\/p\u003e\n\u003cp\u003e2. \u003cstrong\u003eSelect your watch type\u003c\/strong\u003e and desired power reserve\u003c\/p\u003e\n\u003cp\u003e3. \u003cstrong\u003eClick Calculate\u003c\/strong\u003e — get your recommended mainspring specs instantly\u003c\/p\u003e\n\u003cp\u003eThat's it. Three measurements in, full spring specification out.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cp\u003eFEATURES\u003c\/p\u003e\n\u003cp\u003e● Calculates spring height, thickness (with range), and length from barrel dimensions\u003c\/p\u003e\n\u003cp\u003e● \u003cstrong\u003eVerify mode\u003c\/strong\u003e — check whether a spring you already have will fit your barrel\u003c\/p\u003e\n\u003cp\u003e● \u003cstrong\u003eInteractive diagram\u003c\/strong\u003e — see the spring inside the barrel in real time as you type\u003c\/p\u003e\n\u003cp\u003e● Top-down view with Archimedean spiral + cross-section showing height clearance\u003c\/p\u003e\n\u003cp\u003e● Drag handles to resize barrel\/arbor visually\u003c\/p\u003e\n\u003cp\u003e● Animated winding demonstration\u003c\/p\u003e\n\u003cp\u003e● \u003cstrong\u003e6 built-in presets:\u003c\/strong\u003e ETA 2824-2, ETA 2892-A2, Miyota 9015, Unitas 6497, Sellita SW200, Seiko NH35\u003c\/p\u003e\n\u003cp\u003e● Colour-coded fill ratio indicator (green = ideal, amber = tight, red = overfilled)\u003c\/p\u003e\n\u003cp\u003e● Copy results to clipboard — paste straight into a supplier order\u003c\/p\u003e\n\u003cp\u003e● Print-friendly output with your caliber reference\u003c\/p\u003e\n\u003cp\u003e● Dark and light themes (great for bench use under bright lighting)\u003c\/p\u003e\n\u003cp\u003e● Thickness reference chart for all watch and clock types\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cp\u003eNO INSTALLATION NEEDED\u003c\/p\u003e\n\u003cp\u003eThis is a single HTML file. Double-click it and it opens in your browser. Works on:\u003c\/p\u003e\n\u003cp\u003e✓ Windows (Chrome, Firefox, Edge) ✓ Mac (Safari, Chrome, Firefox)\u003c\/p\u003e\n\u003cp\u003e✓ iPad \/ Android tablet ✓ Phone (responsive design)\u003c\/p\u003e\n\u003cp\u003e✓ No internet required after first open ✓ No subscription — you own it forever\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cp\u003eWHO IS THIS FOR?\u003c\/p\u003e\n\u003cp\u003e● Watch repairers who order mainsprings regularly\u003c\/p\u003e\n\u003cp\u003e● Hobbyist watchmakers working on different calibers\u003c\/p\u003e\n\u003cp\u003e● Clock repairers (covers clock and mantle clock springs too)\u003c\/p\u003e\n\u003cp\u003e● Horological students learning about barrel mechanics\u003c\/p\u003e\n\u003cp\u003e● Anyone who's tired of cross-referencing catalogues and guessing\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cp\u003eSHIPS ON USB STICK\u003c\/p\u003e\n\u003cp\u003eShips on a branded USB stick via Royal Mail. Includes the calculator software, full user guide PDF, and your license. Plug in and open — works immediately in any web browser, no installation needed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e All calculations are estimates based on standard horological formulas. Always verify results against supplier specifications before ordering. This tool works alongside supplier catalogues, not instead of them.\u003c\/p\u003e\u003c\/div\u003e\n\u003c!--start-footer-3dsellers.com-ld-html--\u003e\n\u003c\/div\u003e\u003c\/div\u003e","brand":"Red Rooster","offers":[{"title":"Default Title","offer_id":60040896676174,"sku":"mainspring app-1","price":7.95,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0896\/3879\/7646\/files\/10_a01613d0-5335-407f-a54c-cfa7beae4f8c.jpg?v=1783121592","url":"https:\/\/redroosteruk.co.uk\/products\/watch-mainspring-size-calculator-tool-usb-watchmaker-repair-software-eta-seiko","provider":"Redroosteruk","version":"1.0","type":"link"}