I had the same issue when trying to remove and extend 200K and 500K pots on a power module.
These points may be of use to you:
1. Some (cheap?) wirewound multi-turn pots have 'no contact' spots - this obviously affects the voltage\current on your output and can be disasterous!
2. Add another 10K/20K pot for a fine voltage control - the voltage adjust pot is 500K and the centre wiper is connected the pot end terminal so it is easy to add another small pot in series - just be careful not to exceed the total resistance of 500K. Only 2 wires are neeed to connect these two (coarse+fine) pots.
3. 200K and 500K are high impedance. In my power module, the 200K CC pot is actually in series with a 1.6M resistor on the PCB - so it is
very high impedance. Extending the connections to both pots using long unshielded wires is a bad idea! I found that just by putting my hand near the unshielded wires to the front panel pots caused the PSU module to pick up noise and increased it's total current consumption to 1A! Touching any of the pot wires insulation caused even more issues. I used shielded cable (old USB cable) and connected the braid to 0V at the PSU end, and to the pot enclosure at the other end (check for shorts). This cured most of the problems. Just be careful before putting it into a (metal grounded) case not to touch any of the pot wires.
4. For the current CC pot, use a normal pot but fit a large knob for better control.
I can't give you exact values because my unit stopped working after playing with it a while. I ordered a replacement but when it came, it only went up to 28V instead of 30V (the 20-turn pots were actually 460K and not 500k!). I was so disgusted that I returned the module. I came to the conclusion that this 'BOOST\BUCK – ‘DC5-32V LTC3780 Automatic Lifting Pressure Power Step Up/Down Constant Voltage’ [Out: 80W 1-30V] was not suitable for an adjustable bench power supply as it was just too unstable.
I am investigating other boost\buck modules and combinations, but so far have not found anything which actually works without going unstable or generating voltage spikes on power up\down, etc.
See also my blog -
http://rmprepusb.blogspot.com/2019/11/is-d3806-boostbuck-dc-dc-power-supply.htmlI am coming to the conclusion that a DPH3205 module
https://www.banggood.com/custlink/GmGKsh7ggM might be worth the extra expense after all (if you want to use with an ATX PSU).