It really pays to know the part numbers and values of consumable items for these airplanes. For example, several in past posts complained about the cost of 14mm spark plugs for the Franklin. Yes, I think the list price for REJ-38 plugs is close to $40. Larry L. and I both spied comparable BG 707SR plugs on Ebay and we got a lifetime supply for about $2/plug...new. There are several good replacement plugs, by several manufacturers that are approved for Franklin engines. Larry pointed out earlier that VW Beetle exhaust gaskets are a perfect duplicate for the 150/165.....and pre-war engines. The price is right.
The little KP10/10A bearings that support the retract shaft, through the rear spar list for $30+. I have enough for all my future projects that I bought for $4-5. I bought several sets of Timken bearings and races, for the Scott tailwheel, new in government packaging for about 20% of list.
The list goes on.
You can save a lot of $$$, have a lot of fun, if you do a little homework.
Dan