Here is a generic place to start;
I personally use a sheet of lined notebook paper. One or two sheets thickness. Depends on your preference. That also is one of the best cleaning strips you can find. Just close the contacts enough to hold slight pressure on the paper and slide it back until it almost comes out of the contacts. Release pressure and repeat. Don't keep pressure applied off the end of the paper sheet. That traps lint between the contacts and defeats the purpose.
If you need a photo of the following parts, let me know.
They US Army says:
To adjust the hand key properly follow these instructions:
(1) Loosen the locknut on the space adjusting screw and turn the screw counterclockwise until there is approximately 1/4-inch of space between the contacts.
(2) Loosen the locknut on the spring tension screw and turn the screw counterclockwise until all spring tension is released.
(3) Loosen the locknut on each grunion screw. Adjust the two grunion screws until the contacts are aligned. The contact on the key lever should be directly above the contact mounted on the key base. Tighten both grunion screws simultaneously until the key lever remains up or in an open contact position. Loosen each grunion screw slightly until the key lever falls freely. Grasp the grunion screws firmly with one hand to prevent them from turning and tighten the locknuts with the other hand.
(4) Fold a sheet of ordinary paper twice (four thicknesses) and place this paper between the two contacts. Tighten the space adjusting screw until the contacts begin to exert pressure as you move the paper. Grasp the space adjusting screw with one hand and tighten the locknut with the other hand. Remove the paper. The space between the contacts should be approximately 1/32 of an inch. This setting applies to all keys. It is not a matter of individual preference.
(5) Turn the spring tension screw clockwise until the spring begins to exert pressure and raises the key lever. Turn the spring tension screw one and one-half turns clockwise. Tighten the locknut. A pencil mark on the spring tension screw will help you to measure the amount of turn. The amount of spring tension required depends on you. However, it should never be more than the minimum amount necessary to form clear and distinct IMC characters.
d. Improper adjustment of the hand key can result in one or more of the following conditions:
(1) Too much spring tension forces the key lever up before the elements are completely formed, causing short dits and dahs. In addition, you will be required to expend more effort while sending and will become tired after a short period of time.
(2) Not enough spring tension causes the elements of the code characters to run together or the space between elements to be irregular.
(3) Too much space between the contacts has the same effect on sending as too much spring tension. Too little space between the contacts has an effect similar to weak spring tension.
(4) Grunion screws that are too tight cause the key lever to bind. Grunion screws that are too loose might keep the contacts from meeting in proper alignment.
(5) Dirty contacts cause scratchy or intermittent keying. Keep the contacts clean at all times. Contacts may be cleaned by sliding paper between them while exerting slight pressure on the key button.
(6) Locknuts that have not been tightened cause the key to get out of adjustment while sending. Insure that all locknuts are secure after adjusting the grunion, space adjusting, and spring tension screws.