Yes welcome Tim.
I had the 1.25" orion lasermate, sloppy fit in the 1.25"/2" adaptor. Always gave a different result if you turn the lasermat around.
If you can, choose a 2" version with a barlow lens.
I'm totally satisfied with the accuracy of my 2" Astrosystem collimator, also it's reasonably priced. The 2" unit sits nicely in the focuser, no need to use the adapter.
If your scope is a one piece tube the lasermate with it's 45d window is very easy to use, but as I said, in my case it wasn't accurate.
Cheers
Richard