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Make a Frame Deeper
Extending the rebate can be useful if your customers chooses a specific frame moulding that isn’t deep enough for the mount or object. Obviously it’s better to choose a moulding with a deep rebate in the first place - you can filter by rebate depth online.
RabbetSpace from FrameTek can be mitre cut with a spacer & slip cutter and screwed to the back of a frame to extend the depth.
Alternatively you can create a box frame using spacers - cut and join the spacers to fit inside the rebate, slot into the frame on top of the glass and fix in place. Then fix the backing board with the artwork already attached to back of the box.