I made this simple center punch holder on a clip for kaje's modular pegboard screwdriver rail. I'm a total noob with onshape but the file is here if you want to tweak the params to fit your own:
https://cad.onshape.com/documents/78c4f6fa332fc52817ef4eab/w/cb91bfccff0762ce0a2bd52f/e/8196ae29a220814c7cdfdf72?renderMode=0&uiState=66dbe5233ffdfa79fcd7ab5f
The author remixed this model.
A custom clip for holding a center punch or other round tool on kaje's modular pegboard screwdriver rail system.