You can easily see and hear proper impact with your putter. If you are having trouble, work on a very light grip a pure 'swing' and a slightly hooded face (hands ahead). If the ball hops, you've gone too far with the ahead/down. You'll see the true 'roll' fairly quickly.
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"Support the On Plane Swinging Force in Balance"
"we have no friends, we have no enemies, we have only teachers"
Simplicity buffs, see 5-0, 1-L, 2-0 A and B 10-2-B, 4-D, 6B-1D, 6-B-3-0-1, 6-C-1, 6-E-2