M J B Engineering
Mine are just ancient Draper ones which I bought when I was about 18, so probably 10 years before you were born They are actually not too bad but telescoping gauges don't really need to be that great anyway as long as you use them correctly.My new mitutoyo snap gauges don’t seem to be that smooth but I’ve nothing to compare them too.
Just in case you don't know, to use a telescopic gauge you tilt it past level, unscrew and let it snap to the angled dia and then tighten and swing it to level and beyond, that will make sure you get a good reading from it. I have seen people just hold them level and unscrew to let it snap to the dia and then tighten. That won't get an accurate measurement of the bore as the tightening will likely pull it in a bit, also you may not have it exactly level in the first instance.
Maybe they will free up with time. They feel a little rough when squeezing them in. Almost like they’re rubbing a bit inside on an burr.That is strange, mine are buttery
How do you take them apart? If they’re shoddy inside I’ll send them back and get starretts. Not sure if they still are but I think starrett used to make a lot of stuff in Scotland.Cant remember the who it was on ut, they took a pair of Mitutoyo snap gauges apart, they were shoddily made, nothing had been deburred.
(I bought some dasqua, for 18quid a few weeks ago. everything was clean and deburred. Nice finish over all, especially for 18quid)