Chris
imho the mod is well worth it, a new Z Axis rack is included in the kit which is about 5" (125mm) longer than the original, the head now travels up to the top of the column .... about 2" more (52mm), and obviously moves down about 3" more (76mm).
The travel is smoother and the head stays in position. It's a very easy modification to do, just requiring drilling 4 holes and tapping 3 of them plus removing, drilling and sticking the plastic column cap back on ............ about an hour or so overall for an amateur like me, probably about 10 minutes for you guys
unfortunately ................. I don't know anyone in the UK who supplies it, I got mine from Little Machine Shop in the States at the same time as a few other bits ......
>> Click Here <<........ delivery was superb, 4 days .............. it was on offer, so fairly inexpensive, but at that time the £ was worth a lot more against the $
Different story at the moment ................ though .................. Ralph and I clubbed together for some 9x20 lathe belts, we had them shipped to Eric and he posted them over here and that saved a lot, could be a few folks might want bits and bobs from LMS so you could try that ............. I'm sure I could be persuaded to buy a couple of odds and sods.
Just for your info, I've also fitted a belt drive and that is also a good mod, much quieter and smoother, I don't know anyone who regrets fitting one, I've also come across a few folk who have made their own.
Last thought ( me ....... thinking ............. that's dangerous
) the air spring (and fittings) is just a strut off a hatchback car, the only bit you need to source is the rack ............. if you want me to measure the length of the air spring just shout up.
CC .............. aka .................... Dave