Hi aLajos - welcome to HomemadeTools.net

Here are some links that may help:

Homemade Well Drilling Rig - HomemadeTools.net
Homemade Water Well Drilling Rig - HomemadeTools.net
Homemade Water Well Drill Bit - HomemadeTools.net
https://www.homemadetools.net/homema...drilling-rig-2
https://www.homemadetools.net/homema...drilling-rig-3
Homemade Well Drill - HomemadeTools.net
Homemade Well Drill Drag Bit - HomemadeTools.net