Short visit to shop: replaced transport pulley, working on tab mechanism

I PUT THE NEW TRANSPORT PULLEY ON THE TYPEWRITER - TENSION IS PERFECT

The tension maintained in the cord that pulls the carrier left and right should compress the springs in the transport pulley to align with a target notch when the tension is ideal. I took off the broken pulley, installed the new one, stretched the cord over the pulley, and found that the pulley was aligned at the proper point. 

New pulley in place

Broken pulley I removed

TAB MECHANISM WORK

The tab mechanism is complicated, with parts on the carrier, in the operational function area of the body and over on the left where it latches a microswitch to indicate that a long (tab) operation is in process. There is also the cylinder with the individual tab fingers at each column that is rotated to set/clear and which unlatches the carrier when it reaches a finger that is set. 

The latch on the left with the microswitch was frozen solid initially but I now have all the parts moving almost freely enough to work properly. There is a small spring that must be attached to one hook which is bedeviling me as it is soooo tiny and hard to manipulate onto the hook. The tab operational function mechanism almost works properly - it mostly fires one clutch turn and turns the tab tilt bar which should cause the carrier to latch up a tab.

The carrier should lock the teeth out of the space and backspace racks, allowing the carrier to move rightward freely. That lock involves sliding a mechanism to the right (as seen from the front of the typewriter) where it latches. When a tooth on that mechanism runs into a tab finger in the set position, it unlatches the tab letting the teeth fall back into the racks to stop the movement. 

I did more lubrication and manipulation of all the parts in the carrier related to the teeth and tab function. There was a spring unhooked which is responsible for pulling the tab mechanism into its latched position, so I rehooked it. This is continuing to improve and I should have the tab operation working well soon.

CARRIER MOVEMENT REQUIRES MAINSPRING TENSIONING AND SOME LUBRICATION

The carrier moves leftward easily but won't glide to the right as it should when the tab function (or space function) moves the teeth out of the rack(s). It is quite stiff, which I believe is due to clutches on the constantly rotating operational shaft being gummed up and introducing drag. I need to lubricate these and make sure they operate properly.

The mainspring must be put on the machine and properly tensioned. This involves positioning the carrier all the way to the right initially, thus I have to free up the binding of rightward movement first. 

The mainspring is prewound a number of turns and installed while the carrier is in that rightmost position. The carrier return function is then engaged to move the carrier all the way to the left margin. This winds the mainspring further, imparting the power that will drive the carrier to the right during space, print and tab operations.