I had one allen wrench in my tool kit. That is all. I'd like to know the answer to this question as well. I'm tempted to get a big screw driver and a mallet, but it may be better to just get the tool. What do you guys think?
Even with the factory tool it can be an effort in frustration. A cheater on the factory tool usually helps since the handle is so short, but it's hard to get it to budge even then. A well placed and carefully smacked screwdriver seems to start rotation better, and the tool can finish the job after that. But if you don't have the tool I don't think I would purchase it. I've have before, and would do again, the whole job with a screwdriver. (at your own risk)
"Towards the end of the vid, it looks like she may have had a bafflectomy." - MarylandMike
I did it on my 919 with the tool & remembering it going easy--I had one side cover off. I can't remember if I did this on the 919 but I usually use one hand for the tool then twist as hard as I can on the spring with my other hand & it goes fine.