Quote:
Originally Posted by Kev0607
A squirt of penetrating fluid or silicone spray may help. Worked for me when mine was sticking.
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Such liquid lubricants may attract and hold dust which could build up to clog the mechanism. Try using PTFE (Teflon) Dry Lubricant spray which will coat the mechanism with a very fine layer of PTFE dust that lubricates without holding contaminants. I bought a can from Lidl for about £2. It goes on wet but the carrier solvent evaporates leaving the surfaces dry.