These tools are waste of money. They are too flimsy to work properly, no matter who makes them. In order to move Mosin sight the armorer has to clamp the barrel in the soft jawed vise and drift the sight assembly with proper punch. Sometimes one need a bigger hammer to budge it.
Second thing is that barrel thickness varies from year to year. during ww2 they made barrels so rough and thick that even standard bayonets won't fit. Even bayos won't fit from rifle to rifle, so how do you expect this tool to work on all rifles? I won't even get in M38 or M44 territory as barrels were made out of speck as it was up to machinist at the factory to decide how much metal to take off.
Invest in proper vise and good bench, quality brass punches that will work on all future projects, that's my advise.
With respect, some of us have had a different experience, at least with the Elby tools. In my case, a gunsmith 91-30 model has worked just fine on the (admittedly few) 91-30s it has been used on, one requiring some penetrating oil, and flipped upside-down and slipped over the sight hood on an SVT40, pushing against the sight base. I wanted the steel insert and extra thickness of the gunsmith model because I wasn't certain of the forces involved in pushing offset on the base beside the dovetail with the SVT, but in the end I doubt that I needed it. I did have to do a very little bit of clearance filing to fit one one of the rifles, the SVT IIRC.
Regards,
Joel