My only comments on this thread, is that unless you are in a bind for some particular reason, after spending $$$ on boots, bindings, skis and lift tickets, why not cough up another $30 or $40 to get the bases done at a shop, on a machine that will put a solid structure pattern in?
I've stated several times I'm anal about my tunes. I wish I skied as well as my skis are able to perform. My race skis have been tuned by a WC tech (SkiMD) and I even took my back up and tree skis to a local shop to have them get the base flat and nothing else. I'm going to set the base and side edge.
It just seems to me that having a flat ski is too important to be doing it free hand. Yes in a pinch it can be done as Jacques has pointed out and has been good enough to video an abundant amount of information on tuning, which I much appreciate. I've learned gobs from them - thank you.
I really think, as Jacques has mentioned, there is a lot of "art" into doing this the base with a scraper. I could be wrong but there are too many ways for this to go wrong. Not saying shops are perfect. I'm on my 6th shop trying to get a good tune at an "affordable" price. SkiMD is fantastic but perfection doesn't come cheap.
JMHO (and no offense meant to Jacques),
None taken Ken. I do ski on a budget. I have Salomon Falcon 10 boots. New about $750.00. I got used maybe a few times. $7.50! The Power 9-s, or is that S-9's? With plates and bindings I paid $60.00. I like to fix up my used skis by hand. If I want a grind, I live 20 minutes from The Race Place. They do know how to use their machine. BTW I know from past experience that the skis will perform fantastically. I loved them last season after I tuned them. They were fast, just now they are gonna' be faster! Yhee haaa! Be good Air!