Jarviser
Established Member
I was reading one of ALF's recent Blogs about difficulty in getting Yankee screwdriver bits, This is especially so for the smaller 130 size, which has a 7mm diameter bit (advertised at "1/4 inch" for some reason). I know Stanley used to sell an adaptor for the 131 but even they are tough to get hold of.
I made this adaptor from a few inches of 7mm Silver Steel. This is tough but fileable. I think Tilgear sell it.
The 1/4 inch square on the business end is the trickiest as it should be slightly tapered to get a snug fit. The two notches on the other end are simple. The 1/4 square to 1/4 hex screwdriver socket was from a Halfords set (Shown).
I believe the 131 has an 8mm dia bit, but you would need to check.
I made this adaptor from a few inches of 7mm Silver Steel. This is tough but fileable. I think Tilgear sell it.
The 1/4 inch square on the business end is the trickiest as it should be slightly tapered to get a snug fit. The two notches on the other end are simple. The 1/4 square to 1/4 hex screwdriver socket was from a Halfords set (Shown).
I believe the 131 has an 8mm dia bit, but you would need to check.