Durston 2127 Large Ring Stretcher Mandrel

The Durston 2127 Large Ring Stretcher Mandrel is an expanding mandrel purpose-built for enlarging and truing rings with larger diameters. Its compact 92 mm length keeps it practical for bench use, easy to stow in a drawer, or pack into a tool roll. Once secured in a vise, clamp, or appropriate machine fixture, the mandrel expands evenly as you tighten the center bolt with the included hex key—giving you controlled, incremental sizing without distorting the shank.

Features

• Expanding mandrel sized for large ring diameters in the 21–24 mm range
• Compact 92 mm total length for easy bench storage or travel
• Center bolt expansion mechanism delivers even, controlled stretching in small increments
• Hex key included for tightening the center bolt
• Can be secured in a vise, clamp, or suitable lathe/polisher fixture
• Supports gentle sizing adjustments and truing slightly out-of-round rings
• Designed to complement Durston's broader range of ring stretcher and sizing tools

Specifications

What's Included

Notes

Place the ring over the mandrel, then tighten the center bolt gradually with the hex key to stretch the ring. Work in small increments and check the size frequently to avoid over-stretching, particularly on soldered joints or stone-set rings. Always secure the mandrel firmly in a vise, clamp, or appropriate machine fixture before use.