received by the International Bureau on 27 July 2020 (27.07.20)

1. A guide for a circular cutter, the guide comprising: a reflector plate for reflecting a laser and an attachment means for attaching the reflector plate to the circular cutter, on the reflector plate there is formed at least one linear marking which when aligned with a projected line from the laser, is positioned so as to locate a blade of the circular cutter in a plane defined by the laser; and an adjustable connector enables the reflector plate to be adjusted through a range of angles, in the plane of the blade, so as to enable the reflector plate to be oriented at a desired angle with respect to a line laser.

2. A guide according to claim 1 wherein the reflector plate is flat and substantially planar.

3. A guide according to claim 1 or 2 wherein the reflector plate is substantially rectangular.

4. A guide according to claim 1 , 2 or 3 wherein linear markings are defined on the reflector plate and are positioned at angles one to another on a face of the plate which in use faces away from the blade.

5. A guide according to claim 4 wherein the linear markings comprise a pair of marks at opposite edges of the reflector plate.

6. A guide according to any preceding claim wherein the attachment means is adapted to connect the reflector plate to a body or shroud of the circular cutter, such as a circular saw.

7. A guide according to any preceding claim wherein the adjustable connector is supported in an arcuate slot or groove and is movable and lockable with respect to the slot or groove.

8. A guide according to any preceding claim wherein the attachment means is supported by a body that is connected to one end of the reflector plate.

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9. A guide according to claim 8 wherein bolts are supported by the body, the bolts, act as attachment means for releasably attaching the reflector plate to the circular cutter.

10. A guide according to claim 9 wherein the body supports at least two, and ideally four, adjustable connectors, such as screw threaded adjusters with a head that contacts a hard outer protective body or shroud of the circular cutter.

1 1 . A guide according to claim 10 wherein the screw threaded adjusters have wingnuts or butterfly nuts.

12. A guide according to any of claims 9 to 1 1 wherein rubber feet are provided at the end of the connectors for gripping the body or shroud of the circular cutter.

13. A guide according to any of claims 8 to 1 2 wherein the body has a‘wishbone’ or‘tuning fork’ shape and a bolt is provided in each of the two limbs so as to enable adjustment of the adjustable connector.

14. A guide according to any preceding claim wherein the attachment means includes a locking device that attaches the reflector plate to the circular cutter such that the reflector plate is not able to move or rotate with respect to the circular cutter.

15. A guide according to any preceding claim wherein a spacer includes packing means or struts for spacing the reflector plate apart from the circular cutter and/or the blade thereof.

16. A guide according to any preceding claim wherein the attachment means comprises one or more clamps shaped to fit into, onto, or around elements of the circular cutter.

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17. A guide according to any preceding claim wherein the attachment means is adapted to attach the reflector plate to a handle, body, support, casing or blade shroud of the circular cutter or circular saw. 18. A guide according to any preceding claim wherein a series of slots, perforations, holes or apertures are provided in the reflector plate on the linear marking.

19. A guide according to any preceding claim wherein the reflector plate is formed from a metal such as aluminium or stainless steel.

20. A circular cutter has a shroud or casing in which mountings are defined, the mountings are dimensioned and arranged to receive the attachment means according to any preceding claim.

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