Jigsaw centre jig

Use this to cut circles with a Bosch PST54 or similar jigsaw.
Insert a 30mm long 4mm alu/steel pipe in the centre part
Use a ridgid 8mm alu pipe to connect the centre and the jigsaw clamp and secure it with a M8x1.25 screw using the flat allen/unbrako key. It may be necessary to glue the 8mm pipe into the centre part.

BTW: The 'stiksav' STL contains both of stiksav1 and -2 and is there to show how it will look.