Right now I am saving money for a smith machine. So I only work out the following:

Tuesday

Lat Pulldown 50x8; 50x8; 50x4
Bicep 50x8; 50x8; 50x 4
Wrist Curl 50x12; 50x12; 50x 8
Reverse Wrist Curl 15x12; 15x12; 15x6

Thursday

Deadlifts
Bentover Barbell Row
Wrist Curl
Reverse Wrist Curl

I can't seem to fill that last set to 8 reps on my arms so I can increase weight. I've been eating a lot, so I think my diet is ok. What can I do? I don't need to take a break since before this I took like a 3 week break.