@pikeshot1600
Thanks for trying anyway. I'm actually somewhat familiar with hand mortars, having done a bit of reading on them in my search for sources on early-modern grenades. The ones I've come to be most familiar with are flintlock variants produced between ca. 1700-1800. One army that seems to have made use of them are the Russians during the reign of Tsar Peter I, with specialist soldiers (in the artillery) known as "bombardiers" assigned to use them, firing from the shoulder and using a specially issued halberd as a rest. These bombardiers even wore mitre caps like the grenadiers. The grenades were inserted into the hand mortar with the fuse facing outward, and relied on the flash from the powder charge to ignite them. These weapons were used in at least a few sieges of the 18th century, such as the Russian attack on Vyborg in 1710.
As far as the use of hand mortars in the 17th century, I haven't been able to track down much detail, other than the fact that they were used and (as you stated) came with contemporary ignition systems such as the wheellock.
As you also said, the Osprey title on English Civil War Artillery doesn't really cover hand grenades, although it does have some useful info on mortars. One source which does provide a bit of info on 17th century grenades (including an illustration of a period grenadier) is Bouko de Groot's 'Dutch Armies of the Eighty Years War (2)', which is also an Osprey title. De Groot mentions that grenades in this period were known to be made of brass and could weigh up to 5lbs. It definitely makes you see why the early grenadiers were chosen from among the biggest guys in the army, if you wanted to throw something that heavy at a longer range. He also says that, by the 1630s, a fortress of 3,000 soldiers was supposed to have 1,200 of these 5lb grenades in stock.
I know that in the 18th century (and into the early 19th century Napoleonic conflicts), hand grenades were used to give some extra firepower to naval boarding parties. Not sure if the same was being done already in the 1600s. Most references to 17th century grenades that I've found are regarding sieges...