more beginner questions

[Newton Hunt]

That little screw is for adjusting spring tension.

That is very likely a "Schwander" style wippen.

Feels "vague" is rather vague.  Before you can evaluate touch you need
to run through the entire regulation sequence on one or two notes
(preferably several more in each section) after you have leveled the
keys.  Hopefully you have attended to all the other 40 procedures like
hammer spacing, traveling and burning, all screws tightened (plate
action and case).  Setting touch is in the last 1/4 of the procedure.

"Good" touch can be defined as the key moves 0.040" to 0.050" from the
point the jack leaves contact with the knuckle to the bottom of the key
stroke.  This is called _safety factor_, NOT after touch.

Set dip at 10.0 mm 0.374" (block miked at each corner with anvil flat on
the bottom of the block) and hammer height set to 48 mm or 1.875".  Let
off is at 2.5 mm and drop is 1 mm below top dead center of let off.  If
there is insufficient safety factor then raise the hammer no more than 2
mm or deepen dip no more than 0.5 mm.  Do this in stages.  If you still
don't have enough safety factor then check jack position, rep. lever
height, knuckle location, hammer bore and anything else you can think
of.  Take two aspirin and call me in the morning.

If you have too much safety factor then you can lower the hammer travel
1 mm and/or shorten dip to 9.7 mm.  

Regulation is a balancing act between key stroke and hammer stroke. 
Shorter dip and hammer travel - less power, longer hammer travel and
deeper dip means more power but a trade off of repetition.

Lots of luck.

		Newton