Co-axial indicators

Hi all,



I have been doing a bit of work that requires workpiece alignment to an existing bored hole. So far I have been using a standard dial indicator attached to a post and place in a collet. While this has been reasonable, sometimes depending on the diameter of the bored hole it is near impossible.



I had noticed some time back a discussion on such devices, mainly prompted by a purchase of a centricator by Anorak Bob.



Now, I'm not in the market for such a tool, not that I don't appreciate the beauty but it comes down to $ and justification of said $. My question is, what are these other branded coaxial indicators like? I'm looking at the usual stuff on ebay etc.

http://ift.tt/1s4EY09
http://ift.tt/1s4EZRM

http://ift.tt/1s4EZRO



I can't help but think that they will only lead to disappointment in terms of quality, repeatability and usability. My other option is to just use my existing indicators which are all brand name indicators and puchase/make a different attachment method. Such as this:

http://ift.tt/1ukZsnp



Any thoughts?



Cheers,



Simon