ok... but how much does it cost though? is it a quick job?
If it's the mesh then it's a complete gearbox strip down and clean, my main concern is that it has gone like this...
This one had thrown the main shaft bearing and started to use the cltch in it's place, it was jerky when pulling off but rarely missed a selection, it was probably 20 hours labour, but most of the time inbetween work on the car was spent waiting for spares, the problem with gearboxes is that you have to get them open to find out how bad it is, the sum total of parts to repair it though was only UK£270 (Clutch kit, main bearing, bearing seal, gasket sealant, oil and cleaning fluids. As soon as you have the bits that need replacing in your hands, then it's justa mater of a few hours to rebuild the car.
The first thig I would suggest to you though and don't panic at the pictures, is get the selespeed system recalibrated, this takes 20 minutes on the examiner, and it may come down to a fine adjustment on the clutch disengagement rod, if so bobs your uncle, Also I would drain the gearbox oil and check the mag plug, if it's as bad as the one in the image (which shows the same plug before and after cleaning) then start thinking internal failure, note though that not all swarf is gathered on the plug, most sticks to the magnetic pad which lives inside the synchro housing and you would need to split the box to acces this, make sure you get over 1.5 litres of fluid out of the box (should be closer to 2 litres), the one in the picture, barely filled the palm of my hand with fluid. When the box was off, well you can see where the oil went, out the destroyed mainshaft bearing and seal and all over the clutch and bell housing.
This box though, lived on, luckily all the balls from the bearing stayed away from the gears (god knows how) and there was a negligable chip from ONE tooth, after rebuilding it, the calibration was spot on and never have I drive a Sele that was so smooth,the chenges where like clockwork and the car felt like new again, to say that when I test drove it before hand I turned back after 100 yards in fear of rupturing a kidney from the vibration.
But like I say, Calibrate it first and get all the valves checked out on the examiner first, it may be just one of the solenoids is geting sticky, but in a worst case scenario, you could end up with what I found.