ronan
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I had another go last night and struggled again, but I think I understand why now. It was really difficult to push it hard enough while getting the drawbar into the thread. The collets had come with the machine when I originally bought it and I haven't used them at all really as a result of this issue. I took the collet back out and ran a 7/16"-20 UNF tap into the drawbar thread in the back of the collet. I then had another go and that made it much, much easier to get the drawbar most of the way in and then I could push up on the collet and tighten the drawbar. Hooray! I guess most of my problems with the collets have been down to carp threads in the arceurotrade collets. Thankfully they were soft enough (or maybe the tap was taking a surface coating off) to fix the problem.
That's jolly decent of you @Kram, thanks! Will send a PM.
Sadly, yes. It would seem like a big improvement to get it sorted, but it's a tiny little pin (not a key) that goes into a hole in the spindle. When it fails (which, according to the guy I spoke to at arceurotrade, is almost inevitable) it drops down into the gap inside the spindle assembly and thankfully then lies in a little pocket that doesn't do any damage or cause any problems apart from the loss of the pin. Fixing it involves dismantling the spindle assembly, which arceurotrade describe as a very difficult job involving specialist tooling, so I decided I didn't want to go there! I did look at making a top-hat shape pin (that couldn't fall into the spindle) and gluing it in place, but in the end I concluded it was too hard to reliably get it into the hole in the spindle without risking doing some other damage so I gave up and have lived with it. For any tooling that sticks out of the spindle enough that you can hold it with your hand, it's not a problem at all - I'd only struggled with the collets, but hopefully the fix with the tap (described above) will make that better.
Glad it worked out for you and you are back in action with your machine. Vertex collets are a bit more expensive than the chinese made cheap ones, but are better quality. It might be worth buying a few in the more common sizes.