Oscillating multi-tool: setting it up and changing the bit or blade

Learn to safely remove, choose and fit the right blade on an oscillating multi-tool, and check it's secure before use.

OM-01Understand what the tool doesAn oscillating multi-tool has a small blade or pad that vibrates rapidly side to side (oscillates) rather than spinning like a drill or saw. This makes it good for precise cuts, scraping off old sealant, or sanding in tight corners. The same tool head takes different attachments - wood blades, metal blades, sanding pads, scrapers - which all clip or bolt onto the same fitting.

OM-02Make the tool safe before you touch the bladeBefore you change anything, unplug a corded tool from the socket, or take the battery pack out of a cordless one. Do this even if the switch is off. The beginner mistake is leaving the battery in because "it's switched off" - a knock to the trigger can start the tool while your fingers are near the blade.

OM-03Work out which fitting system you haveThere are two common types. A tool-less quick-release has a lever on the tool head - lift it and the old blade drops out, no tools needed. A screw fitting uses a star-shaped bolt, undone with a hex key (Allen key) or a small wrench that usually comes in the box. Check your tool's manual if you're not sure which one you have.

OM-04Remove the old blade or attachmentFor quick-release: lift the lever fully, and the blade should come free by hand - don't force it, if it's stiff the lever isn't fully open. For screw fittings: loosen the star bolt fully with the hex key before trying to lift the blade off, then keep the bolt somewhere safe as it's easy to lose.

OM-05Choose the right blade for the materialA plain wood blade cuts timber only. A bi-metal blade copes with wood and hidden nails or screws. A plunge-cut blade with a pointed tip is good for starting a cut in plasterboard without a pilot hole. A sanding pad is for finishing, not cutting. Using the wrong blade for the material wears it out fast and gives a rough, uneven cut.

1 each · Multi-tool blade (matched to material)

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OM-06Fit the new blade and tighten it fullyMost blades fit onto the head in several positions, usually every 30 degrees, so line it up at whatever angle gives you the best access to your work. Press it fully onto the pins before securing it. For quick-release, push the lever back down firmly until it clicks. For screw fittings, tighten the star bolt firmly by hand feel - snug, not gorilla-tight, as overtightening can crack the blade.

OM-07Check you've done it right before using the toolWith the tool still unplugged or battery out, grip the blade and try to wiggle it side to side and up and down - it should feel completely solid, with zero movement. If it moves at all, it isn't seated or tightened properly and will snap or fly off when it starts oscillating. Once it passes this check, put the battery back in or plug it in, and run the tool briefly away from any material - it should sound smooth and even, with no rattle or scraping noise.

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