Today, do it yourself - The simplest device for drilling holes in cylindrical parts.
You can make it very quickly, literally in 5 - 10 minutes, from the waste material that can be found in any workshop.
Material for the manufacture of methods:
Mandatory conditions when choosing a material, namely steel corners for the manufacture of devices, include their typical equal soundness, and for the good stability of the finished product - this is the difference between their sizes.
For instance:
Corner 25 × 25 × 4 mm. L - 100 ÷ 150 mm.
Corner 40 × 40 × 4 mm. L - 100 ÷ 150 mm.
Manufacture:
The device is so primitive that it is understandable from the photographs, and its manufacture consists only in cutting blanks of approximately the same length, and joining each other after their exact conjugation using electric welding.
I think that this type of work does not need a description.
That's all.
Good luck
From a short video, the usability of such devices is understandable.