Piston material choice.

I think Delrin is Nylon (Glass filled?). I knew someone who didn't appreciate that Nylon is hygroscopic - it absorbs water. He made replacement bushes for the bearings supporting the rudder on his yacht using some "nylon" he picked-up cheaply... Then after fitting them, when he went sailing, the nylon absorbed water to the point where the rudder seized.... So without steering control, pointing the wrong way, and unable to adjust his direction for "home", the local lifeboat launched to tow him back home.... It took him ages to drill out the nylon sufficiently so he could dismantle the rudder and fit Bronze bearings... But cost him a round of drinks for the lifeboat lads in his local! "Materials Choice" is the start of good design. Too many modellers spoil "Excellent workmanship" with "Poor materials choice", IMHO.... (I have done it to my regret). The cost of materials is always a fraction of the cost and endeavour invested in a good model.
Your advice and expertise here is very welcome, Thanks.
K2

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