Best left to a gunsmith.
No.
http://www.realguns.com/Commentary/comar185.htm has a wonderful, step by step instruction sheet.
The T-900 Fire Control System is a new trigger mechanism for Marlin rim-fire rifles. Go to Marlinfirearms.com for more info.
In 1957.
A Marlin Model 60 might be jamming often do to a problem with the parts inside. An older gun might need to be thoroughly cleaned. There could be too much friction or a part is worn out in the trigger mechanism or in the bullet chamber.
Try e-gunparts.com
That is the T-900 system, restricted by Marlin. sales@countrygunsmith.net
Try contacting Marlin.
Simply because Marlin thought it would look better. These gold trigger Marlins are not different than any other Marlin. They were made for a certain number of years with gold triggers, and all models got them at that time.
"go to DIP and buy a target trigger for around $30" I take it from that statement you don't own the DIP trigger. I do, it's been on my 60 for over a year, it does not reduce trigger pull. It's a great rigger, I like the straight profile over the curved Marlin trigger and the adjustment for trigger pre-travel, but it doesn't reduce trigger pull. This has been confirmed by several DIP trigger owners and my Lymann digital trigger pull gauge. There is no simple fix for reducing trigger pull on a Marlin semi-auto. The action has to be taken apart and have parts replaced or modified to reduce pull weight. For anyone really interested in reducing pull on the Marlin 60, 795 or other variant of the Marlin semi-auto, you should log on to Rimfire Central forums and read the information provided in the stickies of the Marlin sub-forums.
rifle basix makes the trigger of your dreams..
Your serial number indicates that your Marlin rifle was made in the year 1972.