I just got this used Palmgren angle vise off the big on-line auction site. No one bid against me so I probably paid to much. These questions are for anyone who owns a similar vise. Being it it used, there was no instruction sheet with it. It looks like the previous owner added washers to both sides of the angle adjusting plates. A) Does your vise have four washers per side? B) Do you tighten the pivot shaft nuts each time you adjust the angle? C) Are there any shortfalls I should be aware of when using this vise?