"With (which) sweep second hand do you mean straight without circle ?
But for what movement eta ?"
Straight without circle.
The movement is a genuine rlx 1570/75 with a 'shortcut' GMT conversion...details are in the rolex sticky, page 2:
Building an MBW Sub + 'shortcut' rlx 1560/70 GMT conversions... - The Rolex Area - RWG
The center wheel, canon pinion, hour and 24H wheels are genuine rlx GMT parts.
The center sweep second wheels/posts are the same for all rlx 15xx movements so the sweep second hand tube is longer for date movements and longer than date tubes for GMT movements. The tube needs to be at least 1.5mm long with a .20mm opening for a GMT...hard to find because of the long tube and small tube ID.
Esslinger has some straight SS hands with long tubes so that is probably what I will get. The tail of the hand is tapered and genuine rlx have straight, even sides so they may need sanding down a bit.
Watch Hand Refills Regular, Medium and Long Post Style Sweep Second Hand (esslinger.com)
"Which GMT hand do you have ?"
It is an 'OEM spec' aftmkt hand and it fits Ok after it was broached to fit...the ID was a hair too small, mostly paint. Do not know where it came from, it was included with the shortcut kit. The tip comes pretty close to the center of the outer 24H markers on the dial. My aftmkt dial is too big in diameter and the dial opening in the case is also bigger than OEM so the outer markers are not right on the edge of the dial opening like genuine but maybe .3 or .4mm away compared to genuine. A genuine spec dial is too small in diameter and just barely hangs in the dial window.
A genuine 1655 dial is 27.3mm in diameter, this one is .5mm too big more of less.
Genuine rlx 15xx hands:
H hand 1.20mm
M hand .80mm
SS hand .20mm
GMT hand 1.80mm
Do not know about ETA 24H hands. Could the 24H hand for a 2893 GMT movement be the same as a 24H hand for a china ETA 2836 GMT conversion? That's a good question.
"WSO have 1655 hands for 1575 but the pics I’m not sure are for the real gmt hand they sold and are not able to give me a serious reply, on the pic on eBay the tip is short like the tiger."
The holes should be rlx 15xx spec and the same length as genuine but always remember: "With WSO, you never know."
I noticed their hand sets for rlx 1655 appear to be silver or gray and genuine hands are black.
"I will try to file down the stock BP gmt hand that is correct for the length but too fat tip and on the neck of the base triangle , how make rolojack on his watch but only on the neck (see pic below blue arrows) I want to file down also the tip (red arrow).
I have sanded a few hands down on the sides with extra fine paper folded over a narrow piece of flat metal but it was nerve wracking. Things go wrong...the lume can crack/fall out, the hand can get bent, and paint can chip.
Hands, dials, and hairsprings give me the willies.