Glued those noggins in the steel - they ain’t going anywhere.
Regarding this method with drill , timber and clamp ….. It will work but … when I properly workout how many holes I have to do and access to the steel then it’s not going to be much fun . Also ( sad to say ) my Dewalt drill died ; smoke ; splutter ; dead 😞
So had to order to new one .
Realising as usual a man fails whilst trying to save pennies I also ordered a cheap mag drill . Not Dewalt ; but it’s yellow 💪