DIY radiator vibrator. Not having a lightweight drill with a rotary stop, I wanted to use hammer action of Hilti TE2 to assist power flush. Solution:- Take piece of hardwood, ( I used beech offcut of old table leg) , Drill 13mm hole 3mm deep and insert small steel washer. Use blunt short stem 12mm masonry bit in drill. Washer centralizes drill bit while at the same time allows rotation and prevents penetration of wood. Of course if you have a rotary stop and a diamond core set, then the 1/2"BSP to SDS adapter can be end capped with a standard fitting, use hole saw to produce suitable size discs from the wife's plastic chopping board, super glue to fitting and for the price of a new chopping board,(optional), you have a solution at a fraction of the price of some well known products.