Dudley,
The fin template is on the SP-TK3 pattern sheet with the plans linked to in post #2.
As Steve mentioned use the part #s from the parts list in the plans to get the parts from erockets.
For example the nose cone is part # BNC-20L. Go to erockets and scroll down the left hand menu to Parts for rockets/Nose cones/BNC-20. Scroll down the main field till you find the BNC-20L nose cone.
Do the same with the other parts.
Note: the 18mm Mini Bertha has a 13mm (BT-5) motor mount.
Just FYI.
The fin template is on the SP-TK3 pattern sheet with the plans linked to in post #2.
As Steve mentioned use the part #s from the parts list in the plans to get the parts from erockets.
For example the nose cone is part # BNC-20L. Go to erockets and scroll down the left hand menu to Parts for rockets/Nose cones/BNC-20. Scroll down the main field till you find the BNC-20L nose cone.
Do the same with the other parts.
Note: the 18mm Mini Bertha has a 13mm (BT-5) motor mount.
Just FYI.