I needed to modify the exposure unit by removing the 6 min clock work timer. It was very stiff to operate and had no indication that it was running or that the UV lights were on. The six minute max period was way to short, you have to bake solder mask film for 60 min under UV, doing multiples of 6 min would have been a PITA. This is one case where simple is best, an illuminated rocker switch (DPST) was dropped in to replace the timer. Straight swap, even the spade terminals where the right size, just a case of enlarging the hole and squaring it off.
I removed the timer numbers with some Acetone on a cotton bud.