OOPs I forgot to include some ref. sources besides the site I posted ( I have lots of other sites)

Printed suggestiions
1. Very GOOD & inexpensie book ( BASICS)
"SCOTTISH FIREARMS" by Claude Blair and Robert Woosnam-Savage
ISBN 0-919316-31-X

2. One of the best (IMHO)) but expensive
"The Scottish Pistol - Its History,Manufacture,and Design By Martin Kelvin
ISBN I-900541-157 & 0-8386-3745-0

Puffer