ORIGINAL: PA Bow/Flinter
I've never used it before, but I would guess that trying to compress even 60 lb limbs would be very hard with that little screw mechanism. There is almost no leverage there and it could really give your hand a beating. Not sure, but thats what it looks like to me. If you don't think you will be using it very often, it may work for the occasional job.
Most of the time I take 5 turns out of the limbbolts to press my bows, but occasionallyhave left them at 70 lbs and have had no problems with the bowmaster. You can do it by hand but the better way is to use a 5/8" socket on the bolt, works like a charm.
My hydraulic jack was fouled up the other day so I put my bow in the bench press just to hold it, then used the bow master to press it.