Some time ago, I purchased a roller ball, inserted in a cylinder and having a screw for fixing it into the wood. I tought to a sharpening guide like Record 161, and today, finally, I decided to realize it. Construction is easy and requires little time. Necessary:
Two hardwood pieces cm 12x4 ca., one piece cm 10x4 ca., 1 cm thick. Two M5 or M6 brass coutersunk bolts and their wing nuts and washers.Bore together, onto half line, one 12 cm piece and the 10 cm piece, so to have a 8 cm distance between the holes. Countersink holes in the 12 cm piece.
The bolts are blocked by gluing the third piece. 
When the glue is dry, the roller ball is screwed at center, under the guide. That is! This guide can hold skewed blade and, having only one point touching the surface, allows to sharpening cambered blades, like scrub plane blades. 
For setting the wished angle it is useful to have a reference board, by which is possible to find the searched value simply laying the front of sharpening guide on the board edge.
Closed Handle Dovetail Saw
Rabu, 17 Februari 2016
Another saw made by Stewie, this time using makore handle, a wood I did not know, but impressive in its warm colour. His comment follows.
I have just finished work on another backsaw build. This time its a closed handle Dovetail Saw.
The handle wood used is Makore. A beautiful colored timber that adds much warmth & charm to the handles appearance. The 0.020 saw plate is 10" in length, and its been sharpened to 14tpi, rip tooth. Being a finely crafted Dovetail Saw it was important to keep the total weight of the saw reasonably light. To achieve this, the brass spine was machined down to a smaller dimensional size of 12mm x 5mm. I hope you enjoy viewing the end result of my work. Regards; Stewie S.
MAKOREtieghemella heckelii
Other common names: Baku, Abaku, Agamokwe,Douka, Dumori. A large hardwood of West Africa. The heartwood colour varies from pink-red to blood-red and red-brown. Sometimes even with a purplish tinge.Texture fine to medium and even. The grain is often straight but many logs have a decorative or chequered mottle, sometimes with streaks of a darker colour. Uses: Special furniture, cabinets, turnery, high-class joinery, interior fittings, framing, paneling, carriage work and boat fit outs. Seldom imported to Australia.