Contre-jour crackelure

So, now it works can I fetishise the SM4? The crackelure finish really chews up the light and scatters it around in way a gloss enamel finish never could – and chrome trim gives twice the shine.

Olympia SM4-still not right

Robert Messenger (hi Robert, thank you) pointed me towards an adjustment screw below and in front of the r/h capstan and advised checking that there was nothing fouling the carriage slides, possibly the carriage lock.

Apart from the lower and upper carriage-shift limiting screws (see photos) on each side of the machine - which are in more or less the place indicated by Robert, I can't see any other means of adjustment.  I have checked, and there's no obstruction on the carriage rails and the lock appears to work perfectly.

Compensating for the small amount of play that the carriage has on its rails does overcome the problem of misaligned lowercase type - but I can only achieve this by physically holding the carriage towards me as I type with my free hand. I don't think the machine has had particularly heavy use, so I guess that the amount of free play of the carriage on its rails is normal. 

I can see the bottom shift adjust screw (second photo) but can only get a too-thin screwdriver to it - with obvious results! I'll buy a better-fitting screwdriver and try that tomorrow - but there's still no way to back-off or re-tighten the lock-nut afterward - apart from pretty extensive (for me) disassembly. Just to get the bodywork off means removing the carriage - and no platen would mean I couldn't adjust the bottom stop of the carriage by trial and error typing.

Again, any help or advice gratefully received. Thanks in advance!

Arrowed: top limit adjustment screw

Arrowed: bottom limit adjustment screw (not in as great shape as it was)