I recently got a Durst Laborator 184 with a vacuum easel. My only problem is that the unit did not come with the vacuum motor. What kind of vacuum will work with this system? The easel size is 25"x30" with a 21"x26" printing area. Also it came with an 8x10 glass negative holder (Nega205???). The system has built in 4-way masking...will this suffice for 4x5 work or will i have to purchase a 4x5 negative holder or some kind of mask? thanks everyone.